Need help in calculating the AHU CFM

[sri30351]

I want to know how calculate the total CFM (Cubic feet per meter) for a Single AHU (Air handling Unit).

I am working in a software company, where 1 AHU have minimum of 70 to 80 supply air diffusers. We have measured the air flow at all diffusers ( for 1 diffuser '4' corners ex: 45+50+46+55 ), so please help me to calculate the total CFM with the collected data.

Thanks
Srikanth

[JRINJAX]

The best way to find out is to get a T&B company to come out and do a traverse on the supply duct and then apply the needed correction factors.

[doubleduece]

( for 1 diffuser '4' corners ex: 45+50+46+55 )

I assume you are measuring one diffuser 4 times, so those 4 numbers added up would be your CFM for that diffuser. I will also assume that whatever you are using to measure must be a hand held anemometer. Unfortunatly doing it that way there is alot of loss, you need a hood to measure it at the diffuser, or like JRINJAXsaid you need to do a traverse reading.

Ditto JRINJAX hire a T&B contractor.