From owner-freebsd-questions@FreeBSD.ORG Thu Sep 18 13:00:28 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 67EAD16A50D for ; Thu, 18 Sep 2003 13:00:28 -0700 (PDT) Received: from montage.altserver.com (montage.altserver.com [63.247.74.122]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6D36F43F3F for ; Thu, 18 Sep 2003 13:00:27 -0700 (PDT) (envelope-from ray@wrightwradio.com) Received: from 065-117-216-149.classicnet.net ([65.117.216.149] helo=192.168.1.18) by montage.altserver.com with asmtp (Exim 4.20) id 1A04wx-0003KE-6b; Thu, 18 Sep 2003 13:00:24 -0700 From: Ray Bagby Organization: Wright Broadcasting Sys. Inc. To: Chris Pressey , freebsd-questions@freebsd.org Date: Thu, 18 Sep 2003 14:58:46 -0500 User-Agent: KMail/1.5.2 References: <3F68FBEF.3040807@potentialtech.com> <20030917174123.2845104d.cpressey@catseye.mine.nu> In-Reply-To: <20030917174123.2845104d.cpressey@catseye.mine.nu> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200309181458.46612.ray@wrightwradio.com> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - montage.altserver.com X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [0 0] / [47 12] X-AntiAbuse: Sender Address Domain - wrightwradio.com Subject: Re: [OT] replacing fan with mismatched specs X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Sep 2003 20:00:28 -0000 On Wednesday 17 September 2003 07:41 pm, Chris Pressey wrote: > On Wed, 17 Sep 2003 20:27:27 -0400 > > Bill Moran wrote: > > This is terribly OT, but I'm asking here for two reasons: > > 1) I have no idea where else to ask > > 2) I know that someone on this list will know the answer > > > > Here's the problem. I have a switch that has a fan in it that failed. > > I need to replace the fan. It's a 40MM .22Amp 5V. > > > > I can't find a fan with those specs anywhere! The best I can find is > > a 40MM .13amp 5V. > > > > So, will that fan work? With the amp rating different like that, will > > the fan just burn out? Will it run just fine? I'm going to be really > > upset if I have to replace the entire switch because of one fan! > > > > Advice is appreciated. > > Disclaimer: I am not a certified electrician, but... > > Voltage and size are the same, so that's good. The remaining figure, > 0.13 amp, tells you how much current the component draws from the power > supply. Since 0.13 is less than 0.22, that means this fan draws less > power than the old fan. Which means that you should be able to replace > it without any danger of overloading your power supply (in fact your > power supply will have a slightly easier time with the new fan.) > > So, in short, yes, it will work. However, something to check would be > the RPM of the new fan versus the old one. A slower fan won't cool as > well, and that might lead to problems of an entirely different nature > (overheating.) > > -Chris > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" -- Chris is right on almost all counts. Lower current draw is no problem. Same voltage and size is real good. The only question I would have is: "Do they move the same amount of air?" See if there is a CFM rating anywhere and make sure it will do the cooling job. Ray