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Fireblock foam burns
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11-16-13, 02:28 PM
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Quest
Apprentice EcoRenovator
Join Date: Feb 2011
Location: Canada
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I'm not aware of ordinary duct mastic able to handle the high heat on furnace exhaust piping.
I'd go with what MN Renovator suggested RE: masonry fireplace sealant instead (or any proper UL rated/fire rated sealant).
Q.
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