[Amps] Reducing blower CFM and noise

[rlm]

=F0  The pressure drop as well as the noise drop will be exponential. =20=

However, if a tube with a large anode cooler is used - such as an 8171=20=

- a 1700-rpm blower will usually do the job, especially for SSB and=20
telegraphy.  What is the diameter of the squirrel cage, Ken?

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=20=

> 1/3 HP
> motor.  If I substitute a 1725 RPM 1/4 HP motor will the CFM drop in=20=

> half?
> Will the roaring sound drop accordingly also?  I hope there is a=20
> straight
> formula rather than working with fan diameter and number of blades =
etc?
> 73,
> Ken W2DTC
>
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Rich Measures, AG6K, 805.386.3734.  www.somis.org/