[Amps] Reducing blower CFM and noise

[Larry Taft]

The comairrotron.com blower web site formulas show the CFM will drop in 
half and the noise will drop 15 db.  Horsepower drops to 1/16  HP if I did 
the math correctly.
73,
Larry  K2LT
drakerepair.com

At 12:13 AM 4/11/2004 -0400, you wrote:

>Hi,
>I have a Dayton pressure blower that puts out 820 CFM with a 3450 RPM 1/3 HP
>motor.  If I substitute a 1725 RPM 1/4 HP motor will the CFM drop in half?
>Will the roaring sound drop accordingly also?  I hope there is a straight
>formula rather than working with fan diameter and number of blades etc?
>73,
>Ken W2DTC
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