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Old 02-29-2012, 02:32 PM   #16
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How hot does it typically get in the main plenum of a furnace?


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Originally Posted by hvac5646 View Post
I would use RTV caulk. Yes, a lot of caulks can are "rated" to 400* but they harden too.

RTV is used to make head gaskets on muscle cars. And it does not harden at high temps.


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