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Windshield install & defrost fans

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sun Apr 26, 2015 5:34 am Post subject: Windshield install & defrost fans

About ready to install windshield but realizing this would best time to plan for install of defrost fans.  Is 4" a standard size? Am I just needing a 4" diam hole ?  Or should it be more or less? Thinking about cutting holes now since I haven't yet settled on cfm output yet nor acquired fans.  Looking for dimension placement relative to windshield--- as close as possible?  2" from ?

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Dave Ford
Cadillac, MI

bhoppe2

Joined: 09 Apr 2015
Posts: 15
Location: Nolensville, TN

Posted: Sun Apr 26, 2015 6:39 am Post subject: Re: Windshield install & defrost fans

I bought two of these fans and grilles from Amazon (see below) and installed them so that they are centered between the IP and sub panel and evenly spaced right and left.  They are wired to run continuously at the lowest speed.  They come with jumpers that you can use to insert between the plugs to reduce the speed from 2000 rpm to 1600 or 1200. They are very quiet at all speeds.

 *  80mm Fans https://www.amazon.com/gp/product/B00NEMG9K6/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1



 *  Grilles https://www.amazon.com/gp/product/B0093Q7YO2/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

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Bruce Hoppe

woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Sun Apr 26, 2015 2:30 pm Post subject: Re: Windshield install & defrost fans

I have two suggestions.



1.  Pretty obvious, but use a metal grill.  A plastic one will melt.  



2.  A high quality fan will save effort because a cheap fan won't last long.  First one lasted about 10 hours.   I then got a much higher quality ball bearing one.  A little noisier which I actually like because it tells me its on but I can't hear it once the engine is running.  I run mine continuously on an integrated switch breaker and a resister to step the speed down so it lasts longer.  Second fan has 140 hours on it with zero issues.

Although I installed it solely for avionics cooling and defrost purposes, just yesterday I spent over a half hour in IMC and for a brief period got speckles of windshield ice most everywhere except above the fan.  I would stop short of calling it anti-ice, but it definitely keeps that part of the windshield warmer.

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Myron Nelson
Mesa, AZ
Flew May 10 2014

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