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CFMs = Qs / (1.1 x AF x CTD)

Where:

 

 CFMs        = Total cooling supply air required for the building, CFM
 Qs        = Total sensible heat gain on building, Btuh
 1.1        = A constant, Btuh/CFM-oF
 AF        = Altitude Factor
 CTD        = Room design temperature minus temperature of air leaving the cooling coil, oF

 AF        = [(1 - 6.8745 x 10-6 x E)5.2561] x 14.696 x 2.036 / 29.921

 

 Where:

         E                = Elevation, feet
         14.696                = Atmospheric pressure at sea level, psia
         2.036                = A constant, inch Hg/psia
         29.921                = Barometric pressure at sea level, inches Hg

 

Ref: (GRP-158) - A.69