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Old 03-26-2013, 06:18 PM   #1
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Exhaust pipe distance


I have a natural gas furnace and a NG hot water heater. The 2" ABS exhausts are going to have to move a little before I put up the new deck. One option is to bring both out through a common joist bay. Is there any rule for minimum distance between two exhausts?

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Old 03-26-2013, 06:26 PM   #2
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Exhaust pipe distance


Depends on the manufacturers install directions but generally the problem only occurs if there is an intake for the furnace involved. Then there is the possibility of the exhaust from either of them being sucked into the intake and damaging the furnace. 2 exhausts won't fight or harm each other but the real answer is with the install manual info as that is what the inspectors refer 2 now.

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Old 03-26-2013, 09:40 PM   #3
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Exhaust pipe distance


You mean 2" 636 PVC correct? white 2" pipe... Two exhausts like Yuri said shouldnt be an issue. If you also have to re-route the intake though it needs to be at least 12' away from the exhast pipes
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Old 03-27-2013, 07:51 AM   #4
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Exhaust pipe distance


Thank you.
Its all ABS original to the house. A quick search explained to me that S636 is now normally required. Its will likely be easier to replace what is there rather than modify it, so I can take this opportunity to upgrade to the S636.
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Old 03-27-2013, 07:58 AM   #5
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Exhaust pipe distance


there is a special ABS to 636 transition glue you must use to attach to the piece at the furnace. I saw 3" 636 at HDepot but not 2". check yours.
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