HVAC Calculating Return Air
HVAC Calculating Return Air
(OP)
Question: From toolbag
Is there a formula or standard in the HVAC industry that explains the correct size opening in sq.in.,on the return air going back to a Lennox roof top unit. The Lennox unit i have is 10 tons.
I was told by an expert in the field that the unit is starving for air. He talked about the static air and didn't explain how i can check the static pressure.
The filters are clean and the evaporator is clean. I also cleaned the condenser several times.
Any help would be great. Thanks
Is there a formula or standard in the HVAC industry that explains the correct size opening in sq.in.,on the return air going back to a Lennox roof top unit. The Lennox unit i have is 10 tons.
I was told by an expert in the field that the unit is starving for air. He talked about the static air and didn't explain how i can check the static pressure.
The filters are clean and the evaporator is clean. I also cleaned the condenser several times.
Any help would be great. Thanks





RE: HVAC Calculating Return Air
You can check the static pressure with a pitot tube, or inclined manometer.