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>> No.1603268 [View]
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1603268

HVAC Question
I got a sweet deal on pic related (differential pressure gauge, 0 to 0.5 in H2O). Hooked it up across furnace filter and turned on fan. It reads 0.15 in drop with a 2 month old filter.

How should I expect the pressure drop to increase as the filter clogs up? At what pressure drop would it be ready to change?

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