All toolsCalculatorsDuctworkFan Affinity Laws
Fan Affinity Laws
Predict fan duty (flow, pressure, power) at a new speed using the fan affinity laws.
The Ensign ToolboxFan Affinity LawsPredict fan duty (flow, pressure, power) at a new speed using the fan affinity laws.
Reference duty (at N1)
m³/h
Pa
Total or static pressure at the reference speed
kW
Shaft / motor power at the reference speed
Speeds
rpm
rpm
e.g. a VSD setpoint
r
Enter the reference duty and both speeds to predict the new duty