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  #1  
Old 07-09-2017, 03:30 PM
sritchie sritchie is offline
 
Join Date: Jun 2015
Location: Boulder, CO
Posts: 88
Default Doubler needed for 120mm defrost fans?

Hey folks,

I've decided to install 2 120mm defrost fans in a spot very similar to Brian and Brandi's:



Do y'all suggest installing a doubler around these holes on the underside of the skin? An .032" doubler with a single row of rivets and corner holes for the #8 screws doesn't feel overkill, but a 1" thick doubler like Vans suggests for the radio stack hole DOES feel overkill.

What are other people installing here to support their fans?
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  #2  
Old 07-09-2017, 04:52 PM
climberrn climberrn is offline
 
Join Date: Oct 2008
Location: Carson City, NV
Posts: 274
Default

Pretty large fans. Mine are much smaller, and lighter and don't see any need for a doubler. Don't need to move much air to be effective.
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  #3  
Old 07-09-2017, 05:38 PM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 470
Default Doublers

I installed fans this size in 2 different Slider 9's. Since I wasn't able to do the structural analysis myself (and it is structure) I used the repair patch part of 43:13 as a guide. The doubler was about 1" wide and got a double row of flush 3/32 rivets. Also made my own "grille" by drilling a hole pattern in a square of .032" which will add in a bit of strength as well. If I'm going to go off the plans a little overkill that hardly weighs anything works for me.

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  #4  
Old 07-09-2017, 06:46 PM
rocketman1988 rocketman1988 is online now
 
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Location: Sunman, IN
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Default Fans

I used the 120s and put a 1" doubler in place with flush rivets...
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  #5  
Old 07-10-2017, 09:44 PM
sritchie sritchie is offline
 
Join Date: Jun 2015
Location: Boulder, CO
Posts: 88
Default

Quote:
Originally Posted by rocketman1988 View Post
I used the 120s and put a 1" doubler in place with flush rivets...
I ended up doing this as well, with a 0.75" doubler to accomodate the fan flange. Here's the result:



It was obvious when I finished sanding out the cut that it needed a doubler. With just the doubler it's nice and still again, and especially with the fan in place it feels great. Thanks all!
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  #6  
Old 07-11-2017, 08:37 AM
DRMA DRMA is offline
 
Join Date: Jan 2016
Location: Sugar Land, TX
Posts: 125
Default

I also installed 120mm fans in this location. I purchased the mounting plates shown at: https://www.newegg.com/Product/Produ...0009-_-Product

This grill made for a very easy install, and comes with both a very solid square aluminum plate (doubler) and a nice grill to fit the round hole. I used flat head screws to mount the plate, and can either leave it open for natural ventilation, or can mount the fans for forced ventilation which is my intent.
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  #7  
Old 07-11-2017, 09:32 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,033
Default No grill, no backing plate option

An option is to not use a grill at all, just drill an interesting pattern of holes in the glare shield instead of one big square hole. This strengthens the area so no backer plate is needed, and eliminates the ugly grill.

Sorry, didn't set up for photos but is anyone wants them PM me your email address.

Carl
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  #8  
Old 07-11-2017, 12:08 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 4,525
Default

Quote:
Originally Posted by Carl Froehlich View Post
An option is to not use a grill at all, just drill an interesting pattern of holes in the glare shield instead of one big square hole. This strengthens the area so no backer plate is needed, and eliminates the ugly grill.

Sorry, didn't set up for photos but is anyone wants them PM me your email address.

Carl
+1. This is what I did. No flex in the glare shield. (In the -10 this is best done prior to installing the windscreen, depending on the exact location of the fan).
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Old 07-11-2017, 12:36 PM
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Raymo Raymo is online now
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
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Quote:
Originally Posted by Carl Froehlich View Post
An option is to not use a grill at all, just drill an interesting pattern of holes in the glare shield instead of one big square hole. This strengthens the area so no backer plate is needed, and eliminates the ugly grill.

Sorry, didn't set up for photos but is anyone wants them PM me your email address.

Carl
+2. Drilled some holes for airflow.

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  #10  
Old 07-11-2017, 01:24 PM
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vernon smith vernon smith is offline
 
Join Date: Jun 2017
Location: Naples FL
Posts: 52
Default

Carl's fan install

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