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Vulcanus 09-11-2011 12:05 AM

Furnace Venting Question

I have a 95% Rheem furnace which has a 3" PVC exhaust vent running horizontally across the basement to the outside. The combustion air is from the basement. I have a natural draft gas water heater which is vented into my 12", single flue chimney with no stainless steel liner. My question is: Is there a code-compliant way to vent both the furnace and the water heater up the chimney?


hvac122 09-11-2011 03:11 AM

No they must be vented separately.

beenthere 09-11-2011 06:19 AM

And your water heater isn't allowed to be vented into a 12" chimney. The chimney needs to be lined for the water heater.

Vulcanus 09-11-2011 11:47 AM

OK, thanks. I'll scrap that idea.

Vulcanus 09-14-2011 10:47 PM

Can I vent the furnace and water heater through the same chimney flue if I install two 3" stainless steel liners, one for the furnace vent and the other for the water heater?


beenthere 09-14-2011 10:50 PM

Your furnace is not approved for stainless steel vent pipe. Or At least I've never seen a 90% plus efficient hot air furnace that was approve for it. Many boilers are though.

Vulcanus 09-14-2011 10:56 PM

OK, thanks again.

I've seen water heaters which have a PVC vent. If I replace the water heater with that type, would it then be permissible to vent the furnace PVC and water heater PVC in the same flue?

beenthere 09-14-2011 11:00 PM

They could both have their PVC pipes ran up through the same chimney.

Vulcanus 09-14-2011 11:04 PM

OK, Thanks a third time!

I will look into that approach.

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