Conversion Between Standard Flow (SCFM) and Actual Flow (ACFM)  
ACFM to SCFM
 Insert flow  ACFM
 Insert pressure  inches Hg (negative for vacuum)
inches H2O
psig
 Insert air temperature °F
 Insert altitude feet
      Flow rate = SCFM
SCFM to ACFM
Insert flow SCFM
Insert pressure inches Hg (negative for vacuum)
inches H2O
psig
Insert air temperature °F
Insert altitude feet
Flow rate= ACFM
Insert stack ID Inches
stack velocity feet per minute
rev 2-8-18
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