MK STYSTEMS

Leaders in Air Handling Equipment and Engineering

FAN LAWS & UNIT CONVERSIONS

FAN LAWS

Volume varies directly as speed:

New CFM = Old CFM x New RPM/Old RPM

Horsepower varies as cube of speed:

New HP = Old HP x (New RPM/Old RPM)3

Pressure varies as square of speed:

New SP = Old SP x (New RPM/Old RPM)2

Pressure varies as square of volume:

New SP = Old SP x (New CFM/Old CFM)2

Horsepower varies as curb of volume

New HP = Old HP x (New CFM/Old CRM)3

COMMONLY USED UNITS

Pressure

Volume Flow

Velocity