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-   -   high efficiency furnace venting (http://www.diychatroom.com/f17/high-efficiency-furnace-venting-157501/)

Dave Purych 09-21-2012 09:36 AM

high efficiency furnace venting
 
I am just wondering if I can or should use the CPVC that Home Depot sells to vent (and supply combstion air) to my new furnace or listen to my wholesale guy. I forgot the name of the pipe he is trying to sell. They are both the same price practically but H.D. is handier. Thnx for your help.

REP 09-21-2012 10:53 AM

The answer is no.I don't know the exact reason but I have never seen CPVC reccomended for venting purposes by the manufacturer.There must be a reason.My guess is that the heat and acid in the exhaust will cause the CPVC to get brittle and crack.

beenthere 09-22-2012 08:06 AM

PVC or ABS is fine.

CPVC ID size is not the same as PVC. So you would need to use 2.5" CPVC when 2" PVC is what is called for.

hvac benny 09-22-2012 12:55 PM

I don't know where you're located, but in Canada it has to be S636 PVC venting. If you can and do use ABS, don't use cellular core.

beenthere 09-22-2012 02:40 PM

I'm in the states. I think the poster may be in Canada, so thanks for that info.

ben's plumbing 09-22-2012 09:11 PM

Quote:

Originally Posted by Dave Purych (Post 1014453)
I am just wondering if I can or should use the CPVC that Home Depot sells to vent (and supply combstion air) to my new furnace or listen to my wholesale guy. I forgot the name of the pipe he is trying to sell. They are both the same price practically but H.D. is handier. Thnx for your help.

no use pvc or abs....:yes:


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