/diy/ - Do It Yourself

And I just noticed that the top front tape is lifting up on the pictures. Time to patch that.

>>599263
I really like that.

>>599271
Gonna re-design the cardboard exterior to use heavy duty furniture packaging cardboard, when I change out the filters. Will make it so that I can just cut the back tape and slide the filters in/out.

>>599274
How about a W or M shape so you can use 4 filters? That would lessen the load on the fan and increase the flow. Kind of like this.

>>599275
Interesting idea. I did buy 4 filters since they were on sale. Will def look into that.

Also note that the air is being pulled through the filters, not pushed through.

>>599279
Yeah, pulling air through is much better than pushing it through.

Something to think about:

>>599291
Neat. Will think about that for the basement.

From time to time some ebay sellers, specialized in industrial or electronics stuff do sell large (like 20x20x8") cleanroom filters.
New in box. Shipping costs sucks though.

used this to lessen the dust during demolition, pullyed the extension cord through the handle to hang it in the air.

Currently trying to reduced the cat litter dust with it but haven't rigged up a slower speed setting and motion sensing yet. Not sure of the results yet but I see the dust go into the filter when I pour the litter.

>cat litter is an inconsistent product, sometimes dusty sometimes not
Might have to try a multi filter application like you have there in the future for more air exchanged on a lower speed setting

Interesting experiment: try taking amp readings of the fan at full flow and with obstructions. Try blocking airflow completely and see what happens.

It just might blow your mind a little and you will think differently about "reducing strain on the fan motor"

Why haven't I ever thought of that? I have a major dust problem in my house - whenever I clean, everything gets recovered in dust within minutes. OP, you might have just saved me a shitton of headache.

>>599291
Looks a lot harder to make than OPs

Where can I get those filters in the UK cheaply? And the fan as well. Thanks.

I could only find those really expensive 10 pound a small piece of HEPA filters for small air purifiers, which are too small to mount on a 12" fan.

>>599406
Poundland do cooker hood filters, they're big and square, also carbon impregnated, so reduces odour. Can't help with the fan.

>>599407
Thank you kind sir. I'm now looking at a 20 quid box fan from ebay which seems to be ideal for this project. Just wondering if I could get a similar 12" fan anywhere else.

>>599418
Get a regular fan and enclose it yourself?

>>599306
>cat litter dust

FFFFF! fucking cat litter dust. I need to build a box for the cat litter that has a filter and fan on top with a sensor to turn on when the cat is in there and stay on for a few minutes after it leaves, like one of those simple motion light things you screw into an exiting light socket then then screw a bulb into.

>>599418
Some old microwaves have really nice vent fans in them that use a centrifugal fan instead of a regular bladed fan. And, they run right off your wall outlet power. I have a really nice one I salvaged and it cranks out the air like nobody's business.

OP is a fucking genius

>>599506
Maybe, just maybe, heh.

Ran for 8 hours today on max in a 350 sq ft room. No heat build up from the motor and airborne dust is noticeably decreased. So I would say, overall, it was a great success.

This is sweet.

Instead of "I have 2 shipping containers and I was wondering if you could give me a step-by-step guide on how to use arduino to transform them into a quadcopter that can lift at least 900 pounds and leave the atmosphere safely under its own power and support human life while on venus and I know how to use a hammer," this guy totally said "I have a box... and some filters and shit. I'm gonna make something I can use."

Truly this is the spirit of /diy/.

Neat idea OP. Thanks for sharing.

>>599687
>>599693
Thanks. Also, you don't even see the beauty of the internal design. I got 16x25 inch filters (the fan is 20") because all the 20x20's were $20 each. Because of that, to fit them properly and provide a stable surface/support for the filters the bottom cardboard is actually folded as pic related.

I guess I have to rebuild that. I have the same problem, especially during the winter months. Did you use a regular fan, nothing special?

>>599763
Yeah, just a simple 20x20" box fan.

>>600000

>>599263
Beautiful simplicity.

Why won't they sell MERV filters in the UK? wtf...

>>600032
I'm sure you can find equivalents. Ideal is MERV 11-13, since those can capture up to 1 micron particles. MERV 13 can even capture about 75% of 0.3 micron particles. So whatever the rating systems are in the UK, you can use that as a guide.

Bravo OP!

>>600030
>>600087
Thanks.

Updating on performance. Room is now virtually free of airborne dust. I think I will make a 1 foot high frame and mount the fan vertically. That way it will blow directly onto the floor, knocking dust up into the air and then sucking it back down through the filters.

>>600369
Don't, you are blowing dust to stick to the floor, better do it upside down, any dust going near the ground gets sucked in.

>>599501
I love this idea to death, but when the sensor kicks the fan on, it'll scare the cat out of the box. Perhaps a one minute delay before the fan kicks on after the sensor is activated?

>>600399
Trap door drops, locking the cat in and closes a circuit connected to a cellphone that calls your phone to tell you to let the cat out of the cage.

It would probably get used to it...probably.

>>600392
Not OP, but it all depends what type of surface the floor is. If it's carpet, you're definitely right; it'd just blow the dust into the carpet and get embedded into it.
A non carpet surface, like wood, linoleum, tile, etc, would be IDEAL, since it's pretty much blowing all the dust off the surface of the floor, making most of it bounce/fly up into the air and eventually get sucked into the filters. This would require a very high fan speed, though.

>>600403
As much as I love torturing cats, this sounds like way too much work! And if your phone was dead/charging, and you forget, hilarity ensues.

Why would you want to disrupt the dust on the floor though? If the point it to remove airborne dust, then don't add more. Just treat your floor as an incredibly convenient dust collecting device and vacuum it once or twice a week.

Wow. I love this idea. Hurry Patent it and sell it with AS SEEN ON TV. you'll make thousands.

>>600703
It's nothing new, it's just a cheap diy air purifier/dust filter.

>>599291
I just pictured loads of these on a massive scale dotting the landscape of any future nuclear wastelands

>>600712
The atmosphere is probably too big and fast for this sort of application.

>>600703
>AS SEEN ON 4CHAN!

I think it could work.

I made one of these using some kind of static electricity generator off ebay. some little 5$ potted brick that I've wired up to a fan. turn fan on, dust gets ionized when it moves through the metal grid and falls to the floor. although my gf keeps turning off the fan and leaving the static generator on. when both are on, i dont get zapped. when the fan is turned off If i touch it, and usually its my dick through my pants moving between her and the fan, I get a jolt of pain.

>>599263
Welp, I know what my next weekend project is.

Its so fucking simple I don't know why I've never seen or thought up of this before.

>>600403

>>600709
>>600715
>>600703

>>600777
holy shit, what number do i call

>>600777

This is the greatest thing I've ever seen on /diy/

OP, I built one with a cube once. Three filters. I honestly didn't see a performance difference. Also all those articles online saying you can match the performance of a high end units isn't true, but they still work pretty well.

>>600777
But is it compatible with shipping container bunkers??

I made a air filter night stand. Admittedly it is a little big for a night stand, but it works.

Basically I drilled a hole in the face case to bring the cord out of the wall instead of out of the back. I housed it in a wooden case. There is a clear plexiglass top with standoffs not pictured. I was thinking about putting lights in it for a soft glow but since it's next to my bed and I'm not 12, I didn't. The only thing left to do really is to build a permanent housing with an slot to remove filter quickly and to put an in-line speed control on the cord or mounted to the back. I've left it run for days. No overheating issues. The fan is older and moves twice the air a new cheap box fan does.

My phone isn't uploading my picture, I'll add it when I have a better connection.

>>600029
Where did 600000 go?

>>600777
OP here, that is hilarious. Saved.

>>600483
>Build high flow, large volume filter
>Vacuuming weekly

The point of this is so I don't have to do that.

>>600789
>performance of a high end units isn't true

Dunno about that. Those units at their base are still just a fan and filter. The only difference with this one and the high end units is that they have HEPA's. I could also add an internal UV sterilization system for about $50, so that still doesn't warrant a $300+ unit. It also moves more volume than those units. I guess the ionizer would be a plus, however I do have one and when using it in the specific room I want it in for most of the time, it makes the electronics freak out.

>>600793
Pic. Sorry for size.

>>600805
Looks like it is blowing into the filter, it is better to have the filter on the intake side. Also why not add additional height and make it ventilate to the sides so you actually have a table surface to put things on?

>>600808
That isn't how box fans work. It pulls air through a filter located below it. The circle piece is just a laser cut piece of Masonite that acts like a shroud to maximize air flow. Also as stated there is a piece of a plexiglass that sits just over a quarter inch off the top surface. This forces air out horizontally instead of up. Its off the floor too because my girlfriend has three cats and if its too close the filter gets plugged up too quickly. I replace the filter every two months and its dark gray.

>>600777
Why the fuck did you make a triangle? A simple force diagram shows that it is not as efficient as a straight-on filter/fan setup.

>>600885
2/10 for effort

if srs, do you even air pressure

>>600777
I'm not even going to lie, I'd buy that.

>>600885
If that was a problem then you'd have massive problems with the filters themselves and their corrugation, because those are not straight either. It is a filter, that's how the work.

>>600888
do you even physics?

Air is pulled through the filter by a difference in pressure. Pressure and force are (more or less, a function) of the same thing. It doesn't take a rocket scientist to realize that the force or pressure on the filter decreases as you increase the angle of fan force.

>>600901
Looking at the macro set up. Of course, you can get more specific as you look deeper into the design of the filter itself. You can bring in the design of the filter, the MFP (mean free path) of the air molecules flow, the porosity of the filter material, etc.

Bottom line is filters work because of a net force applied to it, pulling air particles through it (F=ma). This is freshman year physics free-body diagram stuff.

Are yall really that dumb? Do you really think the millions of industrial designs are doing it incorrectly and they should have triangular designs?

>>600906
It's one thing if you want to use a triangle design for aesthetics and form, but don't try to say it's a better function or more efficient.

>>600906
>Do you really think the millions of industrial designs are doing it incorrectly and they should have triangular designs?

Yes of course.

The more filter surface area the better. Stay in school.

>>600906
>Do you really think the millions of industrial designs are doing it incorrectly and they should have triangular designs?

Actually, industrial designs are boxes with filters on the sides and the fan blowing downwards at the base. They would be triangular to save materials but then you have problems of rain, bird droppings and other debris getting on the filters.

And yes, it is better than placing the filter directly against the fan because it reduced the workload on the fan.

>>600885
>>600906
Everyone look out. Someone just finished a 1st year physics class.

>>600916
The direction of force is still perpendicular to the filter plane. If you are going to talk about 3D design, please specify which plane, angle the triangle shape is you are talking about.

>>600922
Graduate degree in Chemical Engineering and employed as a Process Engineer in Semiconductor manufacturing, but hey, at least I finished 1st year physics. Doesn't look like you have, with this advice.

So according to you, the best, most efficient way to push or pull something is to apply force at a 60 degree (or any other angle), rather than straight on, perpendicular? Really?

If trolling, 10/10. Otherwise, you retards have no hope.

>>600931
Stop being stupid. None of that matters for the OP's device. In fact, 2 filters like that are a lot better for it than having one filter for it, even if that one filter is parallel to the fan. This is real world application, not math bullshit that never turns out as good as your numbers say it will because you aren't applying all the variables. A couple being space efficiency and surface area.

>>600931
Seriously, it's air pressure, not a bunch of rods poking the filter. The whole box is at the higher pressure. It saved him material by not building a trapezoid to fit the oversized filter on his fan.

0/10 you're not even funy, bro.

>>599263
I recently built one of these with 2x 36 inch 1900 3m filters I found at a walmart for 5$ each in a discount shelf. Did the same thing to a 38 inch box fan I had in the garage. After 1 day the house smells so much better. Thanks OP

>>600994
post pictures bro

>>599263
Have you ever seen a Electrostatic air filter/precipitator? They are pretty kickass. I made a extremely efficient one that could clean incense smoke. They're are many different models out there. I think the easiest one is to get a thin metal wire next to a metal plate where the dust or particulates will deposit and stick to. With a metal wire you don't have to worry too much about high voltage. They best thing about this is its super low current. Basically a giant leaky capacitor that charges the particulates in the air to then become attracted to the other terminal. You can easily put a fuse on it to insure it'll never get dangerous.

>>600968
more facepalm....the box is at high pressure? You might want to sit down (probably with your face in a corner) and think about which way air is flowing and how the pressure is affected as you pull air out of an enclosed area...

The inside of the box is LOW PRESSURE.

And saved him material? He bought and used two filters when one filter using a straight on approach would be better.

I can't even....understand how you retards are thinking you're correct.

>>600962
How so? I've already shown with maths that each filter @ 60deg sees only 50% of the fan's suction force.
>"this is real world application, not math bullshit..."
OMG, I'm hurting for our next generation. Good luck getting a job in any STEM field. I'd love to see you say that in an interview.

>>601038
Yes I love them to, but you do realize there was a very nasty class action law suit about these following the issues of free radical production (mostly ozone) which cases rapid aging in most material and reaches frighteningly unhealthy levels in close and half closed spaces like a room.

I love the tech and it has so many positives, but after studying the health effects of high ground ozone you are better off without these things. And if you don't care about your health at least think of what such ionized gases do to your computer.

>>601095
This stuff is one reason we are have the problems we do with STEM jobs now a days.
>"If the math don't prove it must be wrong."
It is like we made math and now expect the physics to follow our designs. Physics does not care what the math says, this is why tweaking still works so well because real world events will keep happening regardless what we write down on paper. This is not to dismiss the power math has as a tool, but at some point you got to go out a do things as we never seem to get every variable perfect. As you and others have painfully demonstrated, be neglecting things like the ratio of air friction to flow speed and how gas flow self optimizes to the path of least resistance.

Take this case, it is true the first particles will not be optimally aligned thus costing more energy. But this is a gas we are talking about, once the internal pressure rises the particles will realign as a new flow pattern forms dramatically reducing such losses. Meanwhile the speed the particles pass through filter is lower thanks to the larger filtration surface area. This lower speed means that the losses to air friction are dramatically reduced. It more then make up for it if the unit is turned on for more then a few seconds at a time. This is why many modern filters have mini triangles, the cost of miss alinement is very low compared to the rewards of a larger surface area.

>>601094
low/high pressure

sorry, I couldn't be bothered to click his picture to tell which way the fan was pointing, and also it is irrelevant.

>>601095
OP here.

While your math is correct it is absolutely inapplicable to the filter, for the reasons that a lot of people have stated above (and thank you for that). As it's been said before, you don't take into account the increased surface area and low pressure being generated inside the chamber, which changes the flow of air as the fan reaches operational speed.

From simple observation dust enters the filters perpendicularly to them and not in the direction the fan is blowing. The other issue is the fan itself. Yes, putting the filter directly will improve performance...slightly...do you know what it will also do? Increase the amount of work that the fan motor has to do, which will increase heat generation and risk burning out the motor and causing a house fire. This is especially a risk when you move into higher MERV classes and HEPA filters because of the massive increase in resistance to flow. I've seen examples of this where people with HVAC systems dump a 3-5" filter right in front of the fan and the fan motor burns out in under 3 years.

What you are arguing is the equivalent of driving your car with the pedal to the metal. Yes, you'll get to where you want to go faster, but you'll also use a hell of a lot more fuel doing it and increase the wear and tear. It's nice that you want to stick to using formulas and apply them rigidly, but sadly that application also requires a modicum of common sense.

>>601038
I do have one of those, but as stated >>601117
ozone and also it messes with some of the electronics I have, particularly my computer.

>>600805
Very cool. Practical and functional.

>>600994
Glad to hear it's working out great for you.

>>601147
>>601117

those lawsuits are absolute bullshit. you have to put your face up to the damn thing and breath it in for hours in order to get that ozone. You can start a lawsuit with walmart about mold in their bread and how you found some before the expiration date, but it still doesn't mean that bread is bad for you or a tiny bit of mold is gonna kill you. You've probably eaten pounds of mold by now. Here is a California EPA report about them.
http://www.arb.ca.gov/research/indoor/esp_report.pdf
Quotes:
"The limited studies available indicate that the
resultant levels of ozone are generally low and not likely to be harmful to health.
However, while not producing as much ozone as purported “air purifiers” that
intentionally emit ozone, some by-product air cleaners may produce indoor ozone levels
that approach or exceed health-based standards or industry test standards, especially
when the air cleaners are used for 24 hours or continuously around the clock (Britigan
et al., 2006; Consumers Union, 2005b; Niu et al., 2001a; Tung et al., 2005)."

"The previous work of
Liu et al. (2000) showed that ozone emissions were dependent upon the overall
geometry of the air cleaner and the temperature of the corona wire surface. The findings
of these studies indicate that ESPs and ionizers that emit elevated levels of ozone
should be able to meet all relevant standards with small design adjustments."

>>601147
Electrostatic precipitators have no AC current to induce any interference in other circuits. The only thing that it creates is a electric field. Move the damn thing away from you computer if you still think so.

>>601186
It was actually in a completely different room, but on the same floor. It would cause the air itself to build up a charge which would then transfer to the metal case. Once the case built up enough charge it would discharge onto the motherboard causing the computer to reset. Even grounding the case didn't solve the problem, until I finally took the cleaner away.

>>600805
That looks awesome. I like how you can look into the swirling abyss of death. I'd like to see more as your project continues.

>>599263
>>599267
>>599268
I just finished making one of these. My camera batteries are charging, but won't be ready today.

I had to have someone deliver two filters to me from the local hardware store ($5 each). They are rated for MERV 8:

>MERV 1–4: Pollen, dust mites, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibers
>MERV 5–8: Mold, spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mix

http://en.wikipedia.org/wiki/Minimum_efficiency_reporting_value

I'm currently on crutches and had to improvise a few things because most of my gear and tools are two flights of stairs away and through some snow. Mine is just the two filters with cardboard on top and bottom. The different is that I didn't use tape since I only have electrical tape handy which wouldn't work right at all. I used salvaged wiring from old electronics to tie edges and corners together for filter-cardboard.

There's air gaps, but it works really well on high. My main concern is cat litter dust and the place already smells a lot better after 2 hours of running the box fan. I've had a HEPA filter unit before and this is nothing close to it, but it really does help. HEPA filter devices make the air smell like...well empty like how distilled water tastes empty.

For $10 in air filters that are rated to last 90 days, it is WELL worth the effort and far easier than I expected it to be.

https://www.youtube.com/watch?v=kH5APw_SLUU
It's funny how in the comments section of this video, they discuss that having a filter right over the fan is a good way to strain the fan. Also, the "scientist" in the video put the filter screen on the wrong side!
Honestly, I'm loving OP's idea more and more.

>>600777
AND lucky trips? Going down in history, Anon

>>601147
>From simple observation dust enters the filters perpendicularly to them and not in the direction the fan is blowing

I'm glad that idiot engineer left the thread.

Mother-fucking Tesla didn't call himself an engineer, because he knew they were retarded, and unable to think outside of their numbers. That's why he called himself an electrician.

>mfw Electrician-in-training

Good design, OP.

>>600777

Nobody will belive this is from 4chan. The model is wearing too much.

Have a great idea and follow through on it?
Better shit all over it and be cunts because it's not perfect in every way.

>>601348
Batteries are recharged. Here's a pic of the ghetto rig I made last night in about 30 mins or less. That fan has been used in a shop for about 15 years maybe. So, its seen better days. It originally cost only $20.

Well-used Fan: $20 originally
2 MERV-8 filter: $10
Cardboard: free from trash
Wire ties: salvaged from trash
Filtered air all day long: priceless

>>601762
I got one from my dad's garage used to blow out years of engine exhaust. The blades were pitch black, and the inside of the box was completely rusted out. I'm thinking about cleaning it up, and perhaps making one as well. Hopefully by the time I make it, this thread will still exist and I can post pictures.

>>601182
For a "bullshit" lawsuit they crippled Sharp and got direct Federal EPA response.

"The concentration of ozone would have to greatly exceed health standards to be effective in removing most indoor air contaminants. In the process of reacting with chemicals indoors, ozone can produce other chemicals that themselves can be irritating and corrosive." - Federal EPA report on Ozone Generators that are Sold as Air Cleaners

You need to read more about this. There is some very interesting ion chemistry involved in this which makes of fun reading if your into that kind of stuff like I am.

Basically it boils down to the weak ones don't clean the air but are safe, and the strong ones clean the air but make other hazardous which are arguable even more dangerous.

>>601979
I was out most of the day today and when i returned I'm normally assaulted with a terrible smell from all the dust in the air. This is normally very noticeable when returning from outside (live in the country) This time the air was noticeably cleaner than outside. It really wow'd me.

It has been estimated that one average tree in its lifetime performs the industrial work equivilant of $1million.

(as in the cost if we were to industrially convert co2 to o2 and clean air, water etc)

>>603282
Trees really don't do very much in comparison to the ocean.

>>600403
>Trap door drops, locking the cat in and closes a circuit connected to a cellphone that calls your phone to tell you to let the cat out of the cage.
>It would probably get used to it...probably.

http://www.youtube.com/watch?v=AleZLZjDUbs

>>599263
OP where did you buy these filters? Or does anyone know where I can get something like these?

>>603282
>>603284
Trees are pretty shit for CO2-O2 conversion and carbon capture. Grasses are actually a LOT better at it than trees, but trees look better and more people associate with them than grass. So you get perpetuated myths about trees.

Here's the big problem though. Fungi, take the CO2 captured by the plants and return it almost immediately to the atmosphere. Also, the more CO2 the more the fungi grows and releases. It is a simple cycle that can't be stopped.

Because of this, the best thing is to find ways to stop causing so much man-made CO2 and CO2 by-proxy of man. But, yeah the oceans are really good at capturing. lol

>>603425
Not, OP, but those in >>601762 were bought at an ACE homecenter. You can get them at just about any place that sell home stuff. Places like Walmart also have them in many sizes and ratings. The higher the rating the more expensive they can be. Like from $5 to $40 easily and not including MERV 15-16 level let alone HEPA.

>>603569
Im in Australia sorry. Any ideas online?

>>603748
I bought them at Rona (Canadian store). I believe they are called "Return Air Filters" in Australia. So look for places that sell those. Seems air conditioning supply/repair stores have them.

>>603751
Thanks mate

>>600777
full house get and brilliant OC? sign me up
>old people lel

>>600906
so this air filter would be better if it was a flat 3'' circle covering the intake with no ripples at all?

>>600906
oh and whats this??is this the design that millions of industries use? that cant be right because,oh..oh... its made up of TRIANGULAR DESIGNS

>>601659
He called himself an electrician because he studied electricity. That word has a totally different meaning in the real world today.

Tesla was an engineer.

>>600906
>Do you really think the millions of industrial designs are doing it incorrectly

Considering we live in a world whose economy is powered by intentionally designed defects so that faulty products can be constantly replaced... yes. Besides, a square is just 2 triangles...

I for one loved this idea, tried the M design to minimize air flow restriction and I'm not in the least bit disappointed. I've been moving furniture lately and the dust was just killing me, I started feeling better within minutes. Thanks for the idea!

>>604950
I know this is probably painfully obvious but I went with 20x20 filters since I knew they would be the same size as the cardboard box the fan came in so no extra materials would be needed

The filter revolution has begun.

>>604950
Oh yes, that's nice.

Mine's still going strong. Its nice not having dust on the surface of my drinks after an hour.

>>603832
Yes he engineered things, he also shit in a toilet, but was not a toilet-eer.

Believe it or not there were engineers in that day that referred to themselves as engineers. Tesla did not care for those, for reasons illustrated in this thread.
>>601122
>>601095

Seriously.

People who fetishize Tesla are never worth listening to.

An easier thing to do, which would not require making any kind of box, and would only use filters, tape, and the fan, would be to take 4 filters, tape them together to make a box out of them, and lay the fan on top blowing upward. Since the fan is bigger than the filters, just put some tape on the fan grille to block off the parts that stick out past the filter box. When the filters are used up, just take the fan off and throw the rest away and put together a new one.

Hey /diy/,
Questions about preferences for IR emitter/detectors.
My senior design team is building a wireless charging/controlled lamp, and for the base station we're looking for an IR pair to detect whether or not the lamp is on the base station, so it knows if charging should be turned on or not.

We were trying to use:
http://www.radioshack.com/product/index.jsp?productId=2049723
paired with some resistors, but they still didn't seem to be working.

Reviews on the RadioShack pair are pretty crummy, so we don't really intend to go back to them for replacements.

Do you guys have any recommendations for IR sources for small projects?
Looking for a price range <$10.

Thanks.

>>605273
>opinion
>blanketing statement

Everyone, listen to this guy!

PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDPUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PU PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI PUDI

>>605273
Tesla suckers are 99% chemtrail ilelminaty jewsdid911 nutcases

>>605350
Edison shill spotted.

>>600885
>>600906
>>600931
>>601094
Don't feed the trolls. Ignore them and they'll go back to their caves.

>>605479
Direct Current Best Current

>>605540
X-rays are healthy too when applied directly over ones body for extended periods amirite ?

>>605933
Don't talk to me about X-rays, I am afraid of them. I stopped experimenting with them two years ago, when I came near to losing my eyesight and Dally, my assistant practically lost the use of both of his arms. I am afraid of radium and polonium too, and I don't want to monkey with them.

>>605954
lol suk sum dik ur a fagget edison

>tfw regretted stemfag that studied philosophy in the free time
Goddamit this thread remembered me of how philosophy or at least some months of industry work should be mandatory in engineering courses. Keep doing god's work /diy/. It's ridiculous to think that most azyn kids who chuggle formula all day have no idea of the basic principles underlining their fields. We need more Faradays and Da Vincis not animals trapped in cubicles with castrated minds and visions.

I'm also going to make one next month when I move into my new place. It's small studio 450sqft with a loft. I will have my cat with me and also I cook a lot of smelly food. So the combo of cat litter and me food experimenting = a lot of smell to linger in small place.

How much more should I expect to pay if I want a carbon infused MERV 8+ / or HEPA filters?

Or is it possible to find just cheap carbon based filters and stack them with the MERV/HEPA?

This is way out of my real of know all thanks! Great idea too!

>>606399
Well to add to that ..do I have other options from filters that will clear smell?

>>606297
Absolutely!

Although I think you posted to the wrong thread, this is about home made air filters. Try talking about that on /sci/, it should get some interesting activity going.

How long can someone expect the filters to last?

>>606563
Depends on the environment, but the normal house can go about 3 months on the cheapest of cheap filters.

>>606568
Would that be running them 24/7? What if you only use it for 6hrs a day when you get home before sleep.. Can I expect 6months or 1years +

>>600777
i fuckin love you. laughed so hard... for rizzle.

>>606568
>>606574
keep in mind in a normal house you put a hell of a lot more air volume through these than your going to like this... that being said, you could probably just run them till they're dirty looking, or if you want a good way to measure it, take the ampdraw on the fan and when it starts to go up appreciably (fan working harder to pull through dirty filters) then replace them

Land Rover used an oil bath filter back in the day. The oil that the steel wool was dibbled in would gather farmyard particulates and service is to replace the oil and slosh the filter with petrol once a year. Very free flowing!

Should be a cheap diy project..

>>606626
I like that idea.

This thread is making me want to try it with a DC fan and a solar panel. It'll run all day with no electric bill increase.

>>606764
>Land Rover used an oil bath filter back in the day.

As did old Volkswagens.

My Landcruiser uses a combo cyclonic and paper filter. Just remember to empty out the dirt cup a few times a year and the paper filter lasted 200K miles. The paper element could probably be replaced with a water bath filter. I'm not sure I'd like to breath the output of an oil bath unit. ar engines don't seem to mind.

>>606889
>I'm not sure I'd like to breath the output of an oil bath unit

It'd be horrific. You'd not last more than ten minutes before you'd have to stop using it.

just put lotion on

>>607169
taking the damn trip off

what kind of cardboard is ideal?
where can i get it?
will this reduce the amount of dust build up in the room?
great idea OP

>>608253
Any cardboard stiff enough to not get pulled out of shape will work. As far as ideal? Doesn't really matter too much.

>will this reduce the amount of dust build up in the room?

It depends on the type of dust and type of filter you get, but yes it should greatly reduce dust.

>>601762
I actually have not turned this one off since I made it. Fuck unfiltered air and cat liter dust.

Op great job!

I am playing with the idea of making a home made HEPA filter and UV box.

My idea is to make a box out of MDF , that will mount a 4x20x20 filter, and multi bulb UV filter, in a mirrored aand baffled section , with a fan pulling air through the system.

>I'm not sure I'd like to breath the output of an oil bath unit

It'd be horrific. You'd not last more than ten minutes before you'd have to stop using it.


might like to consider vegetable oil?

>>605267
>Its nice not having dust on the surface of my drinks after an hour.

What did you expect hanging around Mos Eisley Cantina?

>>609323
Cat liter dust. Fucking cats, man.

>>609542
Nature's Miracle Natural Care Odor Control Clumping Cat Litter

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>>609323
I lol'd

>>606400
just get a good Yankee candle those fuckers smell great!

>>606517
This is what

>>606297

Is talking about. If you can't put two and two together that when you're thinking about the world in strictly formulas, you're pretty useless in any situation other than a theoretical one, then it's a problem.

You did not put two and two together. It breaks my heart to see your predicament Anon. You poor, poor dumbass....along with >>606764


>>607155
You are correct.

Found these filters on walmart clearance and decided to give it a try. I wanted 20x20 though all they had is 16x30. I figured i could make it work. After replacing the crappy grease that comes on the fan's bearings and throwing it together I was surprised at the amount of air it puts out. My filters are low end but were only $2 a pop. after a week straight of running on high. I've decided to build one for my parents as well.

also. instead of ever replacing the filters i could just take a vacuum cleaner to the backside.

>>610169
fucking phone image tilting bullshit

>>610170
round two...soon

>>610172
also. since its not exactly a furnace blower sucking on it i could increase its throughput by cutting those cardboard cross pattern off the filters

>>609235
If you really want to do that, get/make one of these and put in a motor beefy enough to handle the flow resistance from 4" of HEPA. Or even 2 motors side by side with 2 fans. That way you can make a compact box design with both exhaust and intake on the top if you so desired.

Then just place a UV light suspended in the center of the fan...an extra one right behind the filter as well, if you really want to.

>>609311
No, it'd still be nasty plus it would go rancid fast from being constantly exposed to that much oxygen and then smell horrific again.

>>609886
I get 20lbs of $3 cat litter. Why you ask? Because that stuff does not perform as advertised. It never does.

>>610169
>>610170
>>610174
Nice, anon, nice.

https://www.youtube.com/watch?v=kP8EYZvgjd0

>>610684
>oil bath
>rancid
wouldn't you use saturated hydrocarbons?

>>611928
The poster that anon is replying to suggested, "vegetable oil". The fat of which goes rancid when exposed to oxygen.

>>599281
>pushing most effcient
>pulling not
Why then is there no fights started from pulling an opponent but plenty from pushing one?

tldr: pulling>pushing how?

>>612069
Got learn something about how fans work.

Thanks to this thread I was inspired to do the same, however I am from the UK so finding the right stuff to work with was a pain.

But then I discovered my Henry vacuum comes with HEPA filter bags. So I cut it up, folded several times to increase surface area, then taped onto a fan. Glue gun was used throughout to seal all the seams between fabric/tape so it's absolutely air tight. I removed the unneeded front grill since it only added resistance and since it's not a fan any more it doesn't need directionality.

Performance is simply great in all possible ways. Great air filtration, great air flow, low noise. Perhaps looks a bit strange but at least it's done neatly. I should have flipped the filter to the other side though to match it's original purpose but I doubt it matters much if at all.

Thanks for this thread OP. Once you go filter you will never unfiltered air again.

Total cost 20 quid, plus tape.

>>612082
that's pretty neat. But i'm worried it will provide to much wind resistance. You notice that most people in this thread went with a triangular design. This is because it will double the area that that fan has to pull air though. making it easier for it to move the air.

what you got is as if we just put one filter covering the back.

I'm not saying it won't work. It will just be putting twice the strain on the fan drastically reducing it's life.

>>612109
Actually you are right about too much resistance, I think it is not moving enough air as it should.

I would love to make a boxy design so I can stand it up/put things on it. I can, probably later when I could get hold of a wooden box of suitable size.

I used the vacuum HEPA bag because I couldn't find anything that's of reasonable price. I couldn't find MERV filters in the UK and any HEPA filters I could find were bloody expensive for a tiny size (for those little "room air purifiers").

But could you explain why it will reduce the fan's life? It doesn't look to be straining, you know, no vibrations or heat or whatever.

>>612177
anything that makes it harder for that fan to pull air through will put strain on it. true it may not be enough to have an immediately noticeable affect, but I bet if you measured the ampdraw on it you'd find it's drawing more than intended.. and while that may not seem significant, if you run it constantly, over time it will cause premature failure of the unit

>>612240
Problems would come from run away heat buildup in the coils causing them to delaminate. The engineer expects x air flow over the coils from the fan moving air. Putting the box on gives you a lower air flow, and higher current draw, so now the coils are getting hotter. It depends if it can reach equilibrium at a higher temperatue, that's still low enough to avoid damaging the windings, or if it's just going to keep getting hotter the longer you leave it plugged in, which is a sure fire death.

>>612241
Well in that case it seems my HEPA fan is okay.

It's been on for hours so it should have reached stable temp, I just turned it off and touched the metals of the motor. It feels warm but it doesn't feel like it's nearly hot enough for anything to happen really.

But now it's just a performance issue, it isn't moving enough air as I would like so I think I will step it down to a... kitchen hood filter paper which should increase the air flow. But small particles will get through.

>>612253
As it runs the little holes it pules then air though gradually get plugged up with the dust it pulls in making it even harder for it to get air through, Due to it's low surface area it will get plugged up faster.

The lower the surface area the sooner you will need to clean/replace the filter.

It's all just a matter of time.

>>599263
Borrowed your idea OP. Much appreciated. Bought a house in Jan and I've had bronchitis twice (once for 28 days), in theory it's something I'm allergic to in the house. Built your purifier today. I'm hoping there's a significant difference in my air quality soon.

>>612574
nice. not OP but keep us updated.

bumping from the depths of hell for the world needs to know

Could a filter like these help get rid of that annoying fine sawdust that I just cant seem to get out of my shed?

I usually leave all doors and windows open and go at it with a leaf blower, but it still leaves a fine layer of dust on everything the nest day.

>>613901
certainly

Inspired by >>604950
The all new 2014 design. I have terrible allergies and this seems to do the job. Most of the time was spent making a custom box (exact dimensions to just drop the fan on top).

Cats and pollen are no match for this beast!

>>614594
nice, I think I'm going to try one of these. Do you think this is better than the triangle design? Is it wroth buying twice the filters?

>>614594
Nice

>>614944
I'm not him, but in theory it is better because bigger airflow hence better efficiency. Whether it is worth it or not, it's the same in terms of money value because they last longer and cleans more efficiently.

>>614944
>>614950
Thanks. I feel this design generates almost no strain on the fan and allows for the air to be distributed evenly on a room.

One of the issues I saw with some of the designs posted here was that the output was very directional (to a side), while this design pushes the air upward and down, pushing dust, pollen, etc into the filters for cleaning.

The fan is not attached and it works great. Anothr big advantage is being able to tape the corner of a scented drier sheet inside (the center of) the bottom, and have clean and nice smelling air blowing out the top.

I actually ended up using 3 filters. One 20x20x1 and two 12x12x1 (measurements in inches). 3 large filters could have been an overkill.
They are all HEPA grade that filter pollen (the large one even filters odors).

On this picture, you can see a badly taped bottom. That's because is a second bottom just to provide structural integrity to this prototype (aka: make the box sturdy). The first bottom is completely sealed (duct tape of course).

>>614967
Why hasn't someone commercialised this design yet?

Or better question... why are air purifiers which uses the same principle usually so poorly designed (tiny fan and filter) and expensive?

This is one of the better threads I've seen on /diy/.

I have a question about capacity. I have a 2 story house. I'd like to install one of these in my basement (for noise and space reasons). Would this help at all with the rest of the house? Stairs to basement don't have a door. Or is airflow between floors so slight I'd only help with the basement (which would be useful, I have a lot of compuers down there.)

>>615086
>>615086
I highly doubt it. It wouldn't be any different than having a commercial air conditioning system installed with the ceiling vents (for intake and exhaust) being on your basement.

I took the above in consideration when I made >>614594
The idea being that cool air tends to sink, so that by blowing air upwards, it could create a draft on the way down that would then drag unclean air into the filters, where the process would repeat itself again.

Because of that, I'm guessing this particular idea wouldn't work as well in the cold season with warm air inside the house (warm air rises and stays up there), but that's not a problem since pollination (my main drive to make this) doesn't occur during winter, so I don't need to clean the air as much.

So where do you guys use them?

>>614971
>Why hasn't someone commercialised this design yet?
They have. They are quite common, just not consumer level devices you can pick up at Walmart. When I was younger the local hardware store used to sell what looked like box fans with brackets on the side just for mounting filters. They were advertised as helping woodworkers keep the dust down in their local area when cutting wood.

>Or better question... why are air purifiers which uses the same principle usually so poorly designed (tiny fan and filter) and expensive?
They are cheaper to manufacture and the filters wear out faster so you have to buy more of them. Again, this is a consumer level device thing. If you're buying cheap shit you get cheap shit and they will bleed you of many whenever they can.

Same reason its hard to find fans not almost entirely made out of plastic anymore. My last box fan I would mount in my window, so it got lots of sun. After about 5 years of this the plastic grill was so brittle that it came apart in my hands when I took the fan down to clean. A year or so after that the plastic blades started to show cracks, so I junked it.

>>615094
I place my box right where I need it. The fan isn't attached and the box weight about as much as a regular cardboard box weighs so there's that.

I don't even need to run it much. Just 5 minutes in the lowest setting and the room I am at feels fresh for the next hour or so.
At night I stir all the blankets and bedding items and let the box run on my bedroom some ten minutes on medium speed to get a very clean environment to sleep in.

This reminds me, I need to add handles to my prototype.

>>600777
Pretty good. Pretty damn good.

>>599306
buy silicon based one and never look back.

>>615116
it's a possibility the cats might be allergic, I've tried corn based litter in the past.. only to not like smelling corn 24/7.

>615125 continued
I also read up on the whole 'slowing down a fan' etc topic, sadly I've only found 350-400USD DC motor fans used for greenhouses that I could get at low RPM

>>615097
>>Why hasn't someone commercialised this design yet?
>They have. They are quite common, just not consumer level devices you can pick up at Walmart. When I was younger the local hardware store used to sell what looked like box fans with brackets on the side just for mounting filters. They were advertised as helping woodworkers keep the dust down in their local area when cutting wood.

https://woodgears.ca/dust/air_cleaner.html
Matthias actually focuses on this kind of thing, he's deeply afraid of micron-sized dust.

>>600777
> Order in the next 30 minute to receive 1/3 of a tonne of genuine imitation crab meat!

>>615177
Interesting. Wonder if putting a torque reducing gear system on the fan would improve efficiency and power.

Bumping to keep the dream alive.

>>600777
>filters out reefer smoke
calling bullshit, you cant filter that out
i speak from personal experience

>fucking false advertising

Hijacking this thread a bit. I've got trouble with dust as well, are there filters to buy for vents that look like pic related without lessening airflow?
I live on the bottom floor with a lot of foot traffic on a gravel path right outside my window, so a lot of dust that gets kicked up and goes right into my apartment.

>>617619
All filters lessen air flow. I would just tape it up because you don't need that vent pretty much.

>>617636

There's only one other vent in the entire apartment, in the bathroom. Of course they lessen airflow to some degree, but what material should I use?

>>617677
Are you sure the dust is from outside? It is much more likely it is just normal household dust. Gravels don't make dust.

Hello all, an update from >>612082 here.

The vacuum filter was too much of a resistance so the air flow was too slow to circulate my room completely, so I tried kitchen hood filters with the same setup, but without success.

So I went and bought this proper filter rated G4 and hooked it up and the room smells so fresh every breath is an enjoyment.

And here is some knowledge I found out about this sort of filtration. (From https://woodgears.ca/dust/dylos.html)) The TLDR is "Air filtration is primarily for comfort and esthetics, not health." Which is true in my case since I only wanted the room to look cleaner.

With this in mind, I would think G4 level which is about MERV 6 (around 5 microns according to http://en.wikipedia.org/wiki/Air_filter)) would be sufficient for my case since I don't suffer from anything air borne, and anything above (e.g. HEPA which is 0.3 micron) will just add to the air resistance.

TLDR Use proper air filters, unneeded filtration adds resistance hence effectiveness, my room smells like Himalaya now

>>617848
>Air filtration is primarily for comfort and esthetics, not health
I can't imagine that removing particulate matter from dust, pollution, mite feces, allergens, etc. does not positively impact health rather significantly

>>617863
It has been shown in studies that children and people that grow up on farms have a far lower chance of ever having allergies because of their higher exposure to Irritants.

just something to think about

>>617867
There are gradients between a completely sterile environment and a completely polluted one. I'm not suggesting exposure to certain things doesn't condition the immune system, but clearly a lot of the stuff floating around which we breathe in constantly has negative health effects. I'll take my chances on a dust-free environment at home, thanks. Besides, I can always get those "irritants" as soon as I leave the house...I just don't need them as roommates.

>>617636
>All filters lessen air flow.

Technically true, but you can use a filter with such a large surface area that it won't affect the fan's performance.

>>617867
I grew up on a farm, I have terrible allergies. I played in dust hay barns all my childhood too. There's just too many variables for the current studies to encompass them. The more they study it the more the results get closer to normal, probably due to Dunning–Kruger effect and that other one I can't remember the name of.

Having a fan filter in my house has REALLY helped with my allergies thus far.

>>617848
Peace of mind and enjoyment of your surroundings has a positive effect on your health as it lowers your stress levels. So, it isn't all just about the direct benifits of dust filtration and dust's impact on the human body specifically.

>>617848
that's a very clean looking air filtering system you got there. good times when you can breathe easy

>>617848
If You Buy A New Box Fan Keep it In The Box cut a Square on both Sides And There Should be Enough Room To Slide a Filter In. Saw It While Planning My Spray Booth

I should totally make one of these.

The only question is how to keep the cats from tearing up the filters.

>>619317
Put 1/2" hardware cloth over the filters. I used a sheet of this stuff over my sliding patio screen door to protect it from cats climbing it and raccoons tearing it up to get in. Best thing I ever did for the door. After years of battling cats and raccoons and fixing the damn thing all the time it is finally safe and still useable. Nothing has made a mark on it in 2 years.

I have a really strong 230 volt motor with fan laying around what I could use. The issue is that it makes a shitload of noise and is pretty small(40 cm diameter fan)
Should I get something else or can I somehow slow it down with a resistance? I also have a commercial filter laying around but it's not really effective and needs commercial filter changes.
tldr; what kind of motor and fan should I use

>>619423
Just get a light bulb dimmer for it.

would it cause too much strain on the motor if I just wrap a filter over the front of a box fan with a bungie cord?

>>619553
or a fan speed controller. all light dimmers might not be able to handle switching the inductive load

>>619571
you want the filter to be at the back (where the air is sucked in)
someone could explain better but it's something to do with air pressure or something about blowing into a filter wont work

>>619423

You could do like buddy said and get a 240v dimmer, probably fairly cheap from the UK.

Just make sure it's motor rated.

>>619553
>>619592
Heh forgot those existed.
Reminds me of my retarded family using it on their computer but that's well off-topic
thanks

>>599263

/diy/

solving problems for the burbs and the ghetto since I don't know when.

>>614594
I have an air filter/beef jerky machine that is designed very similarly to this pic

a cube on the floor with 4 filters, one on each side, fan sits on top.
Then 4 filters lay on top of the fan and are sealed into the fan. I lay strips of seasoned meats on the filter on top, then lay another filter over it. all the top filters have beef between them, the filter that make up the cube remove dust from the air.

That shit will make a batch of beef jerky overnight. The good kind, too. none of that cooked or pasturized shit. dried raw meat

I dont know how heat pumps work in the real world, but would this cool my house down?

I already have a 3ft square hole in my floor going directly to the basement

>>620830
Shiiit, here the pic

>>620830
yes, if you extend the vent to near the basement floor you will get even better results (cooler air at the bottom)

will these filters filter out cigarette smoke odor?

>>621047
If you buy good ones, yes. Shitty ones not so much.

>>599263

if only it were this simple to crank out boxes of reliable pleasurable condoms in your own home

>>600805
what if you wanted to play chess?

>>622448
I'm pretty sure he'd beat your intellect.

>There is a clear plexiglass top with standoffs not pictured.

>>600793
> There is a clear plexiglass top with standoffs not pictured

Are they inch high standoffs? Anything less would surely impede airflow.

>>622684
plus it's not really an efficient design when you can just blow sideways and have zero resistance in front of the fan

Any idea where I could get filters in Australia?

I reluctantly live with 2 cats and the hair that gets everywhere is getting to me. Would this build help reduce the amount of hair on my things?

>>622889
no, the cats will clog the filter

>>622900
I am not sure if I should laugh or feel disappointed right now, feels weird.

>>622889
Yes, it works well for airborne hair from cats.

>>622710
The filters should be at any hardware store

>>601038
im interested in this. can you provide more info

>>599263
Looks good and operable. Great job thinking outside the box and u saved money, tats wat counts.

>>600885

Is this diagram efficient enough rather than using
2 filters?

>>624855
that doesn't do anything because you didn't change the surface area of the filter. You may as well make it cheaper and put it right in front of the fan, op used two filters to double surface area and increase airflow.

>>624886
I only got one filter at the moment. Rather than putting the filter right behind the fan and restricting air flow I want to use this set up to increase airflow while only using one filter.

>>624855
the angle is irrelevant, it's a gas being sucked through, not a rod being dragged or whatever you drew.

I have 2 Scythe UltraKaze 120mm computer case fans that I think im going to make a small solder/3d printer air filter with.
I dont have the room for a big box fan

>>600777
You forgot: "DUCT TAPE - MODULARLY INDESTRUCTIBLE"

>>625189
hah, gay

seriously, your idea is really just a toy. it won't filter out anything since any filter you can make it fit wont be rated nearly enough to trap smoke or anything small enough. just not enough power. also make your own thread because it doesnt really belong here

>>625197
Thanks for your unguided criticism and general unhelpfulness.
But I disagree, 250CFMs with appropriately sized active carbon filters is overkill for a solder fume trap.

But yes, I guess my project doesnt have to do with cardboard and box fans so Ill go elsewhere.

>>625197
he brings fresh and closely related ideas to a thread thats two months old, and you shit on him.
thanks for your wonderful contribution; keeping diy classy

>>625199
please make a new thread on this. I am highly interested and want more info on this.

>>625199
Disregard the sentiment of tat arsehole anon, u r on the correct site, some anons are just fuckin mean, and ignorant.

>>615116
>try it
>going ok
>first two weeks are up
>pour the crystals into the trashbag
>reeks of cat piss
>air out the room
>8hrs later
>still reeks of cat piss with new bag of litter in there
guess im going to sleep on the couch .. fuck

i need this fan setup to scrub the air from cigarette smoke. Do i buy a high merv filter or should i buy a carbon filter from 3m?

>>625974
both are okay, as long as it's rated to filter out smoke (smaller than 1 micron)

Check your ductwork, OP. You'll likely find it's got a few yards of unsealed, uninsulated duct going from the furnace to the vents. Seal 'em up with mastic, fiberglass tape and insulation. Squirt some expanding foam around the ducts where they enter to the vents. You might also need to remove the vents themselves and insulate around the duct there. Once you do all that, you'll see a decrease in dust. Also check around your ceiling fans and light fixtures. There are usually gaping-ass holes around those things, and they need to be filled in, as well. Put sweeps on your entry doors or raise the thresholds. Finally, seal behind the power outlets and light switches throughout the house.

All that stuff will make a big dent in how fast the dust builds up. And, of course, change the furnace filter like you're supposed to, using filters suited for your equipment.

I figured, hey...what the hell? And I built one. So far, so good. Gonna leave it running over night and see how it works. Everyone in my family has absolutely terrible allergies, so if this helps at all, I'll be super pleased.

Guys, I guess most of us use a desktop computer in their room.

Why the fuck not use this kind of filter setup directly on the case of the Computer.

The Air which gets onto the electronic parts is quite free of dust, which prevents dust buildup a lot. And it will still complete its air filtering function.

>>626897
Big fan makes too much vibration

>>626900
It only vibrates when its a cheap unbalanced one. Also bigger fans don't need to spin so fast to get a big flow.

Also what problem do you have with vibration?
If you would operate the same fan in the same room you can't complain about the sound.

>>626904
>It only vibrates when its a cheap unbalanced
All fans vibrate

>Also bigger fans don't need to spin so fast to get a big flow.
...that's the point, to get big flow, if not why make this in the first place, also all spinning things vibrate

>what problem do you have with vibration
http://youtu.be/tDacjrSCeq4

>complain about the sound
it's not the sound

>>626793
There is a more natural way to combat allergies. Your body is obviously missing something it has had for millions of years. If you reintroduce it your problems will cease.

http://en.wikipedia.org/wiki/Helminthic_therapy

>>626926
Allergies are generally caused by a hypersensitivity to a substance normally found in the environment, not a lack of something. You get some ragweed up your nose and your immune system things is Ebola and freaks out. This hypersensitivity is cause by your body not knowing what the fuck its dealing with and going into panic mode. There are two ways to deal with this: histamine blockers and exposure therapy.

Histamine blockers (anti-histamines) are drugs of various types that lower your bodies reaction to the invading substances. Stuff like benadryl. Just to be clear, they generally doesn't effect your immune system, they just keep your nose from running, that kind of shit.

The latter basically exposes your body to the substance and measured amounts and acclimates your body to whatever it is thats causing the problem. This is how people with "peanut allergies" are able to have peanuts without dieing. It takes for fucking ever and can be expensive but it works. The same thing with stuff like ragweed.

Basically, you can think "clean living" for your allergies. Since the 19ths century our homes have become more air tight, we filter our air with HVACs, we clean out food and homes and bodies. This removes all the harmful shit but also the stuff thats harmless, so our immune systems are unaccustomed to many common or seasonal intrusions. Just to be clear on that though, peanut allergies or dairy allergies and ragweed or pollen allergies aren't quite the same thing and the same treatments wont work with everything. Its a case by case thing. Still good to have a doctor look at you before you start having PB&J for every meal.

>>626951
>tfw instead of using benadryl like everyone tells me when allergies act up, I just tough it out and continue on as normal
So I wasn't being a retard after all?

>>626962
Well, no, you were still retarded. Normal exposure generally wont help clear up the problem, nor will taking anti-histamines prevent you from developing a normal reaction to the harmless "invaders." Basically you let yourself suffer for no reason. No harm done of course, and you saved a buck on the benadryl.

>>599263

I'm really struggling to find any filters in australia, can only find them on ebay but get raped on postage. Anyone had any luck?

>>605954

How's that oatmeal?

Just buy a bunch of computer cases and install blue led fans (they must be blue led fans red wont work) and runt hem all over your house

2nd year engineering student here. I'm not that babby physics fucktard from earlier in the thread that caused a shitstorm in what started off as one of /diy/'s finest threads. Now, even if you hate me because you think engineers are faggots, please hear me out. Here is the reason that OP and the others are correct:

The system in consideration is boxfan and filter unit. The system has an inlet and an outlet, where the fan is the outlet and the filter(s) are the inlet. The filter adds a resistance of [x] to the air flow and has an area of [a]. Add a second filter, and you double inlet area to 2[a]. HOWEVER, the resistance from the filter remains the same. It would only increase if you overlapped the filters, making the same stream of air go through twice the obstruction. By adding more filters to the unit, you add more inlet are with the same amount of resistance. It's the same principle as sucking in water through a straw. Adding more filters would be analogous to sucking through multiple straws.

What doesn't really matter in the design is the shape and orientation of the filters. The air simply isn't moving fast enough for that to make a difference. In these situations, The "M" shape would work just as well as one that were puffed out to a pentagon. At this point it's about being efficient with space.

I hope I explained that well enough. Also, a side-note about the engineer hate - there are dumbasses in every profession, no exceptions. That asshat from earlier in the thread is a perfect example. I promise you guys there a plenty of intelligent engineers. So next time you encounter an engineer you hate, focus your hate on the individual instead of extrapolating it to engineers as a whole. By making broad and downright silly assumptions about a group based on one retarded individual, you are being just as close-minded as the individual you claim to be better than.

>>627073
yeah same here, no bloody clue here either mate. I'll check mitre 10 tomorrow.

Perhaps this?
http://www.ikea.com/au/en/catalog/categories/departments/kitchen/20821/
>NYTTIG FIL 559
>Good to know:
>By simply washing the filter in a dishwasher once a month and drying it, you can extend the life of the filter up to 3 years.
>dishwasher safe
NOICE
I know crap about anything but $70 for 3 years of clean air sounds 5/5 pretty dece

>>627660
>>627073
Any store that has home improvement supplies, any store that is for heating and cooling, etc.

>>601762
tape up those seams or you're not filtering shit.

>>606400
filters with a carbon layer generally help to remove odors.

That's usually advertised on the filter packaging, though.

>>606563
Until they get dirty.

>>609235
>>600798
>>610484


could someone elaborate on the use of an internal UV light source? I have looked on amazon and cannot find anything that seems suitable...
also, i thought UV sterilizers/sanitizers were for hard non-porous surfaces only.

picunrelated

>>628435
lol hardly. plenty of air goes through the filters. more than the few cracks actually. the filters aren't very fine. you can hold your hand in front of them and feel a breeze pulling through them.

>>627660
I understand this filters odours do to being activated charcoal it has a high surface area thus particles adsorb onto it and are trapped blah blah.
But, will it filter dust etc just as well? Or is it better to get a furnace filter like others ITT?