Helpful? 0

Diverting a stove pipe interfering with chimney draft?

I am in the planning stages of building a home, which includes a wood stove in the great room. To create the best draft and because of window location, I am limited on where I can place my stove. The best location is centered in my great room, but places it directly under an supporting beam. My thought is to run the stove pipe several feet up from the top of my stove, divert it around the LVL with a 45 degree elbow, and another to bring it back to vertical and continue straight through to the roof. I'm wondering whether this will have a large impact on my draft and/or cleaning of the pipe? FYI, the pipe will be located in the house, double walled stainless steel, and come out close to the peak of the roof.

Thanks in advance.

Asked by Matthew Michaud
Posted Thu, 01/02/2014 - 16:56


4 Answers

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I just put in a 6" flue for a small wood stove, in a difficult location. It rises 4 feet from the top of the stove, then turns 90 degrees and goes through a wall to a tee where it goes vertical again. It then rises 5 feet to an offset consisting of two 30 degree elbows with 3 feet between them, then finally goes up another 12 feet. More turns than what you're describing and it works fine. I typically use Simpson DuraTech and they offer either 15 or 30 degree elbows, no 45s. You should consider how you are going to support your offset, and whether it will be aesthetic (the usual supports are galv straps).

Everything is class A except the 4' on top of the stove and the 90. You can probably use single wall or double wall inside your room and convert to class A just below the ceiling.

Answered by David Meiland
Posted Thu, 01/02/2014 - 22:17
Edited Thu, 01/02/2014 - 23:24.

Helpful? 0

David is right -- you can get away with a few elbows when you are installing stovepipe or a wood-stove chimney. Here are a few caveats:

1. The more elbows, the harder the chimney is to clean. A straight, vertical flue without any elbows will always be easiest to clean.

2. A 45 degree elbow is always better than a 90 degree elbow.

3. The fewer elbows, the better.

Answered by Martin Holladay, GBA Advisor
Posted Fri, 01/03/2014 - 06:52
Edited Fri, 01/03/2014 - 09:22.

Helpful? 0

Thanks for the info. Martin-when you say "...Using one 45 degree elbow", won't I need two 45s to return my pipe back to vertical? I understand your comment on not returning it back over the LVL once it has cleared it.

Answered by Matthew Michaud
Posted Fri, 01/03/2014 - 09:06

Helpful? 0

Yes, you're right. Two 45-degree elbows will return the pipe to vertical.

Answered by Martin Holladay, GBA Advisor
Posted Fri, 01/03/2014 - 09:21

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