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Posted by Dan on April 23, 2010 at 09:34:09:
We have a ntural gas boiler with direct vent out the sidewall of our house. The vent is stainless steel grated opening that is about 7" x 7" square. Around this square grate is an integrated stainless flange that is screwed to our painted cedar shingles.
The shingles where this flange is screwed have blistering white paint, and the wood has turned a dark brown underneath (scorched looking).
I removed the vent as I was concerned about the condition underneath. There is a pipe within a pipe for the exhaust with fiberglass insulation (which is intact) between the 2 pipes. The plywood etc seems fine.There is a 1" space all around the pipe where it goes through the plywood and shingles.
It seems that the heat is being not transferred from the pipe to the siding but from the flange, which is screwed directly to the shingles.
Is there any way to fix this (halt the transfer of heat from the flat flange to the siding)?
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