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Old 01-20-2009, 06:24 PM   #1
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Exhaust leaking back into house?

We have a gas boiler that is vented out our basement wall. It is a 6x6 square with a double wall round vent going out. On the outside it has a downward shield with a mesh screen. When the furnace runs exhaust is coming back thru between the double wall. It is worse when it is windy. The vent is galvanized and is roughly 15 years old. The screen is clean and there is no visable problems. It is very cold (zero/below) We are wondering if this is actually exhaust or if it is steam. How would we tell the difference? We have a carbon monoxide detector and it hasn't gone off.


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Old 01-20-2009, 07:22 PM   #2
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Have it checked.
CO detectors don't go off until almost too late.


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Old 01-20-2009, 07:38 PM   #3
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I'm trying to understand this double wall pipe. Is it pvc or metal? If it is metal it may not be code.

Last edited by SKIP4661; 01-20-2009 at 07:39 PM. Reason: typo
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Old 01-20-2009, 09:23 PM   #4
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Post some pics of it. Sounds like a similar type of venting they use for thru the wall fireplace venting. The old Clare and Olsen and York Concept 2000 furnaces had a thru the wall metal kit which was ugly and damaged the stucco etc and is obsolete. You can still get some Weil McLain boiler metal thru the wall kits I believe. Sounds like our poster needs to seal his wall around that unit with a HIGH grade of outdoor silicone which does not deteriorate quickly with the sun and UV rays. If the boiler is NOT setup properly and the burner is not burning cleanly it can produce CO and get back in the house. At least fill that crack with fibreglass pink insulation until you get it sealed properly.

Last edited by yuri; 01-20-2009 at 09:27 PM.
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Old 01-21-2009, 05:42 AM   #5
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The double wall is metal. Judging by the general response we are calling the heating guy today. We have not been running the furnace since we burn wood as well.

This is my first experience with this board...thank you to everyone whom took the time to help us out.

We just weren't sure if we were being parinoid. Watching the pennies.

Thank You,

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