does anyone know how to calculate a blower CFM, given:

Motor Spec:

motor RPM = 1470rpm

3 phase induction motor

Type Y 180L-4

415V, 40 Amps

Power = 30HP / 22kW

Frequency = 50Hz

diameter of motor pulley = 250mm

Blower spec :

diameter of fan pulley = 200mm

Fan diameter = 710mm

No. of blades = 10 blades

Thickness of blades = 3 mm

Type of fan = Centrifugal Fan (Type BC)

Efficiency = 85%.

Does anyone know how do i calculate the flow rate of the blower from the given motor @ fan RPM?

and if i want to know the air velocity produced at input and also at output?

please help me...

## Comments rated to be Good Answers:

Re: Calculating CFM for a Blower" by ducon on 11/07/2008 9:51 PM (score 2)