View single post by hvacdrd
 Posted: Tue Oct 31st, 2006 04:59 am
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hvacdrd



Joined: Wed Aug 16th, 2006
Location: Michigan USA
Posts: 1186
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 Unless your hand is calibrated to "feel" cfm(cubit feet per minute) I would suggest a simple temperature rise check at the furnace.

Measure the air temperature at the return air duct (should be about room temp) then measure the supply air temperature a few feet downstream of the plenum. Subtract the return air temp from the supply air temp and compare this to the rating on the name plate (ie - 40-70F). If the temperature rise is above the rating then speeding up the blower is an option after you verify the filter is clean, the blower wheel is clean, the a-coil is not plugged, and all registers and return air grilles are open.



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