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Is there a simple way to test the air flow/pressure inside my HVAC fan housing?

Is there a simple way to test the air flow/pressure inside my HVAC fan housing? Perhaps some kinda guage I can attach to the blower unit of my fan box for the HVAC?

Why? I'd like to test with new filter and then old, to determine when it needs changing.

so, I'm looking for a simple, cheep differential pressure gauge or some means to tell if the filter is dirty and thus constricting the flow through the fan unit.

zaronas4 years ago
get some ductape and a bike tire pressure gage or similiar thing tape it sealed then see what it says, your best bet would probably be with a mechanical not a digital. then again you could always make some fiting with an actual bike tire and nozzle and measure that air pressure
SIMPLEST differential pressure sensor is a manometer ! All you need is a U tube made of plastic pipe. Pipe one end to one side of the filter, the other to the other side. You should only see a very few inches of drop.

Colour the liquid to make it easy to see.

Steve