CFM mearsuring Jig?

[James Hebert]

Is there a simple JIG one can rig up to estimate the CFM being pulled by a dust collector through a 4 " pipe?

Maybe some sort of calculation based on the deflection of a know size/weight object at the measured diameter of the intake?
thanks

[Cliff Rohrabacher]

Is there a simple JIG one can rig up to estimate the CFM being pulled by a dust collector through a 4 " pipe?

Maybe some sort of calculation based on the deflection of a know size/weight object at the measured diameter of the intake?
thanks

You can do a slant tube monometer. They are easy to make and calibrate. After that it's just a few calculations.