What is this pipe size? | Hearth.com Questions and Answers

What is this pipe size? - # 1887

Question:

I have a Fisher Stove with an exterior flu pipe that measures approx. 9.25” in diameter. There is another pipe inside this one that is only a little smaller that I assume creates an air space. I need to replace a 3’ section and the top cap. CAN SOMEONE PLEASE HELP!!!


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Answer:

That is probably not enough information to get a replacement part. The chimney sounds like class A double or triple wall, but there have been at least 10 brands. Best bet is to remove a piece and bring it into a knowledgeable retailer.

If it uses air to insulate…most popular brands are Dura-Vent and Air-Jet

If it uses packed insulation, it could be metalvent, metalbestos, security or others. However, most of the double walls are only 2” bigger than the inside diameter - i.e. 8” on the outside.


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