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If you are measuring the pressure inside the duct, before the diffuser, the pressure should be detectable. The velocity pressure is given by Pv = pV^2/2 where Pv is velocity pressure, p is the density and V is the gas velocity. Taking a wild guess at a velocity of 5 m/s, gas density of 1.29 kg/m3, then Pv = 16 Pa The static pressure should be equal to ...


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Mine was freezing over and not cooling the house. I had recently replaced the filters so I made sure all the vents were open. I noticed there was no airflow so I checked the A/C coil up in the attic... I pulled the panel off and it was completely blocked by lint. I used a wide vacuum brush and sucked all the crud off and now there's airflow again and the ...


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Are you 100% certain that it blows when the thermostat opens the call for cooling circuit to shut it down? Or, does it run for a good while, shut down, and then you notice that the fuse is blown? If I were you, before going down that rabbit hole I would put one more fuse in it, run it for 5 minutes or less, shut it down from the tstat yourself, and see if ...



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