Dear All,

I have a comment from the USGBC that the fan power for each individual HVAC
system be determined using the fan supply volume for that specific HVAC
system as determined from Section G3.1.2.8. and *that fan power* must then
be broken up into supply, return, exhaust, and relief.

is this mean , for example , if I have a system with the following
specifications :
Supply 69,482 CFM
Return 58,003 CFM ( 83.5% of the supply)
OSA= 11,479 CFM (16.5% of supply)

and the total fan power using section G3.1.2.8 is 85 KW (Calculated using
the supply volume).

what is the value for the return fan in this case?

So the braken up will be