CFM Calculator

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1 - Electric heat - temperature rise method:
CFM = BTU's / (ΔT x 1.08)
Input: Temp. rise(°F) ΔT , Volts & Amps

phase
formula: CFM = (Volts x Amps x 3.413) / (ΔT x 1.08)

ΔT °
volts
amps



or enter any two parameters to get the third:
ΔT °
BTU's
CFM's

2 - Velocity method:
Input square inches of duct & ft. per minute

formula: CFM = (Velocity in ft. per min.) x (area in sq. ft.)

choose duct type