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Old 10-26-2010, 05:16 PM   #1
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Filling gap between furnace exhaust vent pipe and ceiling


There are significant gap/clearance that I'd like to fill between my furnace exhaust vent pipe and ceiling. What should I use to fill/seal the gap so it won't catch fire and still preventing cold air to go through?

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Old 10-26-2010, 05:42 PM   #2
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Filling gap between furnace exhaust vent pipe and ceiling


High temp silicone, metal patch with the correct sized hole cut out, storm collar with RTV. More then one way to skin a cat.

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Old 10-26-2010, 05:56 PM   #3
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Filling gap between furnace exhaust vent pipe and ceiling


A Vent Fast pipe hanger/firestop for your pipe size would work best.
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Old 10-26-2010, 06:43 PM   #4
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Filling gap between furnace exhaust vent pipe and ceiling


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Originally Posted by tkfd3s View Post
There are significant gap/clearance that I'd like to fill between my furnace exhaust vent pipe and ceiling. What should I use to fill/seal the gap so it won't catch fire and still preventing cold air to go through?

I actually picked up a firestop for Bvent at home depot. You need 1" clearance between the Bvent pipe and the drywall/studs.

-Jeff
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