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1. [Amps] Reducing blower CFM and noise (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Sun, 11 Apr 2004 00:13:38 -0400; 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; /archives//html/Amps/2004-04/msg00073.html (6,438 bytes)
2. Re: [Amps] Reducing blower CFM and noise (score: 1): Author: "RICHARD GEORGE" <k6kwq@msn.com>; Date: Sun, 11 Apr 2004 07:18:37 -0700; I think you will find it will reduce the output to 1/4 of the orignal. I had a similar experience years ago trying to go in the reverse of what you are doing. K6KWQ Dick "12 Volt radios are for wimps; /archives//html/Amps/2004-04/msg00074.html (8,185 bytes)
3. Re: [Amps] Reducing blower CFM and noise (score: 1): Author: rlm <r@somis.org>; Date: Sun, 11 Apr 2004 09:18:49 -0700; 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; /archives//html/Amps/2004-04/msg00077.html (8,271 bytes)
4. Re: [Amps] Reducing blower CFM and noise (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Sun, 11 Apr 2004 13:31:10 -0400; 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; /archives//html/Amps/2004-04/msg00078.html (7,918 bytes)
5. Re: [Amps] Reducing blower CFM and noise (score: 1): Author: rlm <r@somis.org>; Date: Sun, 11 Apr 2004 10:58:20 -0700; That will provide plenty of pressure at 1700-rpm, even for the 8171's big brother. cheers On Apr 11, 2004, at 10:31 AM, kenw2dtc wrote: The pressure drop as well as the noise drop will be exponential; /archives//html/Amps/2004-04/msg00079.html (8,645 bytes)
6. Re: [Amps] Reducing blower CFM and noise (score: 1): Author: Larry Taft <ltaft@charter.net>; Date: Mon, 12 Apr 2004 22:36:50 -0500; 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; /archives//html/Amps/2004-04/msg00084.html (7,942 bytes)

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