[Amps] Reducing blower CFM and noise

[kenw2dtc]

The pressure drop as well as the noise drop will be exponential.
However, if a tube with a large anode cooler is used - such as an 8171
- a 1700-rpm blower will usually do the job, especially for SSB and
telegraphy.  What is the diameter of the squirrel cage, Ken?

*******Rich, The diameter of the blade is 9.5 inches.
*******Thanks,
*******Ken W2DTC

















On Apr 10, 2004, at 9:13 PM, kenw2dtc 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