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Firewall Wire Pass Through

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billhuntersemail(at)gmail
Guest

Posted: Sat Jul 23, 2016 10:04 am Post subject: Firewall Wire Pass Through

Hi all,  

On my airplane there are two rectangular/square holes that wire bundles pass through. One hole is 1 inch by 2 inches and the other is a square 1 inch by 1 inch hole.  

What is a best practice and also cost effective way to Fire block these rather large holes?  

Aircraft Spruce has a contraption for this purpose however it is only a 1 inch by 1 inch so it would not be applicable to my larger whole and there product is a bit pricey.  

The previous installation simply had red RTV silicone squirted in between the wires 

Thanks for your help! 

Bill Hunter

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ceengland7(at)gmail.com
Guest

Posted: Sat Jul 23, 2016 10:29 am Post subject: Firewall Wire Pass Through

On 7/23/2016 1:02 PM, William Hunter wrote:

 	  Quote: 	
		  

 Hi all,



 On my airplane there are two rectangular/square holes that wire 

 bundles pass through. One hole is 1 inch by 2 inches and the other is 

 a square 1 inch by 1 inch hole.



 What is a best practice and also cost effective way to Fire block 

 these rather large holes?



 Aircraft Spruce has a contraption for this purpose however it is only 

 a 1 inch by 1 inch so it would not be applicable to my larger whole 

 and there product is a bit pricey.



 The previous installation simply had red RTV silicone squirted in 

 between the wires



 Thanks for your help!



 Bill Hunter



The 1x2 is a bit big; do you need that much area?
	




FWIW, you can duplicate the pricey Spruce kit by buying a stainless grab 

bar & cutting it about 1-2" out from the flanges (a 2fer). Various 

diameters typically available from big box stores, or ebay/amazon. I've 

also seen 1" stainless flanges on ebay for a reasonable price. Instead 

of RTV, use intumescent caulk.

https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=intumescent%20caulk

You can get the latex based stuff at big box stores, or the better stuff 

at ACS. (either is probably good enough, and a lot better than RTV.) 

Instead of squirting it in the hole (messy if you need to add/remove 

wires), squirt 'strings' of it on a non-stick surface & let them cure. 

Then stuff the empty space with the strings.



You'll still need the firesleeve & stainless clamps to finish the job.



Charlie

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racerjerry

Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY

Posted: Sun Jul 24, 2016 1:54 am Post subject: Re: Firewall Wire Pass Through

Remember that the purpose of a firewall is ..................to keep FIRE out of the cockpit to give you a minute or two to try to get your airplane on the ground and you to a safe place should an engine fire occur.  Any firewall penetrations should be minimized.   You might consider plugging your rather large openings with sheet metal similar to the firewall material - hopefully stainless steel.  Use stainless pop rivets.  RTV won't do the job.

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_________________
Jerry King

Jim Baker

Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA

Posted: Sun Jul 24, 2016 5:43 am Post subject: Firewall Wire Pass Through

http://www.unifrax.com/products/blankets/fiberfrax-ceramic-fiber-blanket/



Jim Baker

405 426 5377



--

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billhuntersemail(at)gmail
Guest

Posted: Sun Jul 24, 2016 8:27 am Post subject: Firewall Wire Pass Through

 	  Quote: 	
		   FWIW, you can duplicate the pricey Spruce kit by buying a stainless grab

bar & cutting it about 1-2" out from the flanges (a 2fer).
	




!!!WHOA!!!  I certainly came to the right place for advice!!!



I just cyber bought a 2fer of stainless steel firewall fire block flanges

for $11.72 !!!DELIVERED!!!  (cleverly disguised as Moen exposed flange mount

stainless steel grab rail)



https://www.amazon.com/gp/product/B001U6EI92/ref=ox_sc_act_title_1?ie=UTF8&p

sc=1&smid=ATVPDKIKX0DER



Santa Amazon will show up on Tuesday with my gifts...according to my

smartphone calculator app...that is $5.82 each for the stainless steel

flanges (ok...plus the cost of the wear and tear and electricity to use my

cutoff wheel and a ride on the belt sander).



The creativity and "resourcefulness" (read Cheap-Ass-Full-Ness) of the

people on this forum is really astounding...I feel right at home!!!  



Oh...BTW...the stainless steel clamps used to attach the red fire block

sleeves are also called "CV Joint Boot Clamps" and four can be purchased

DELIVERED for less than 7 bucks 



https://www.amazon.com/gp/product/B00D4NB4VE/ref=oh_aui_detailpage_o09_s00?i

e=UTF8&psc=1



The 1.25 ID Aeroquip fire sleeve (I bought 6 inches for each of my DIY

"Firewall Penetration Kits" can be purchased from Pegasus Racing delivered

for $15.00 (dang...shipping was 8 bucks)....



So the grand total for TWO Firewall Penetration Kits is less than 30 BUCKS

($11.72 + $0.18 + $15.00 =$26.92)!!! 



Still...a bit pricey for my standards but well within the threshold of

credit card pain. Well worth the price of admission to this forum!!!



THANKS AGAIN FOR YOUR HElP!!!



.



Cheers!!!



Bill  Hunter

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ashleysc(at)broadstripe.n
Guest

Posted: Sun Jul 24, 2016 9:42 am Post subject: Firewall Wire Pass Through

Hi All;

I have used these flanges (for grab rails, not firewalls). They are not too heavy and should do the job nicely.

Cheers!   Stu.



---

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billhuntersemail(at)gmail
Guest

Posted: Sun Jul 24, 2016 12:14 pm Post subject: Firewall Wire Pass Through

Thanks Stu!!!  

Bill Hunter 

  

On Jul 24, 2016 11:48 AM,  <ashleysc(at)broadstripe.net (ashleysc(at)broadstripe.net)> wrote:[quote]--> AeroElectric-List message posted by: ashleysc(at)broadstripe.net (ashleysc(at)broadstripe.net)

 

 Hi All;

 I have used these flanges (for grab rails, not firewalls). They are not too heavy and should do the job nicely.

 Cheers!   Stu.

 

 ---

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ceengland7(at)gmail.com
Guest

Posted: Sun Jul 24, 2016 12:36 pm Post subject: Firewall Wire Pass Through

Bill,



Stainless worm drive hose clamps are a lot cheaper, and much easier to remove/replace when you make wiring changes.

https://www.amazon.com/Worm-Gear-Hose-Clamps/b?ie=UTF8&node=979130011



On Sun, Jul 24, 2016 at 3:11 PM, William Hunter <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:

[quote]

Thanks Stu!!!  

Bill Hunter 

  

On Jul 24, 2016 11:48 AM,  <ashleysc(at)broadstripe.net (ashleysc(at)broadstripe.net)> wrote:[quote]--> AeroElectric-List message posted by: ashleysc(at)broadstripe.net (ashleysc(at)broadstripe.net)

 

 Hi All;

 I have used these flanges (for grab rails, not firewalls). They are not too heavy and should do the job nicely.

 Cheers!   Stu.

 

 ---

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billhuntersemail(at)gmail
Guest

Posted: Sun Jul 24, 2016 2:13 pm Post subject: Firewall Wire Pass Through

Thanks Charlie... good call!!!  

Bill Hunter  

On Jul 24, 2016 2:43 PM, "Charlie England" <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:[quote]Bill,



Stainless worm drive hose clamps are a lot cheaper, and much easier to remove/replace when you make wiring changes.

https://www.amazon.com/Worm-Gear-Hose-Clamps/b?ie=UTF8&node=979130011



On Sun, Jul 24, 2016 at 3:11 PM, William Hunter <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:

[quote]

Thanks Stu!!!  

Bill Hunter 

  

On Jul 24, 2016 11:48 AM,  <ashleysc(at)broadstripe.net (ashleysc(at)broadstripe.net)> wrote:[quote]--> AeroElectric-List message posted by: ashleysc(at)broadstripe.net (ashleysc(at)broadstripe.net)

 

 Hi All;

 I have used these flanges (for grab rails, not firewalls). They are not too heavy and should do the job nicely.

 Cheers!   Stu.

 

 ---

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