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Backhead/firedoor joint

Posted: Fri Dec 22, 2017 8:04 am
by jlakes85
Hi all,

I've determined that my firedoor ring isn't completely flush with the back head and therefore I have a but of an air gap between the the firedoor frame and backhead during mock-up. Are there any hi temp sealers that would work to fill this gap? I thought about ultra copper, but just want to check that it will stand up to this service. Thanks again.

-jlakes85

Re: Backhead/firedoor joint

Posted: Fri Dec 22, 2017 8:30 am
by Marty_Knox
Furnace cement

Re: Backhead/firedoor joint

Posted: Fri Dec 22, 2017 8:52 am
by Bill Shields
you can also use woven fiberglass, like we use on furnace doors. Stick it on with high-temp RTV (good for 3000 F)
Once everything is in place (including the door), you can trim the excess off with an Xacto knife

Re: Backhead/firedoor joint

Posted: Sat Dec 23, 2017 9:43 am
by jlakes85
Sounds good. Would either the RTV adhesive or furnace cement have the required strength to use them completely in lieu of threaded mounting studs?

Re: Backhead/firedoor joint

Posted: Sat Dec 23, 2017 10:38 am
by Marty_Knox
NO

Re: Backhead/firedoor joint

Posted: Sat Dec 23, 2017 10:59 am
by jlakes85
Gotcha, I'm glad I asked

Re: Backhead/firedoor joint

Posted: Sat Dec 23, 2017 11:05 am
by JohnHudak
How much of a gap are we talking about here? .005" or 1/8"? At what point would a gap be "too much" Didn't the prototype fire doors have small holes in them?