New Chimney for Mark III

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Post Thu. Jan. 30, 2014 8:13 pm

I'm planning to install a Harman Mark III in an addition and unfortunately the location where I need to put it rules out a masonry chimney. So stainless steel it is. I can either go straight up through the roof (cathedral ceiling) or out a sidewall, clear the eave overhang and then up. Either way it would be 6' or so above the roof. Would one of those options have an advantage over the other? I like to avoid roof penetrations whenever possible, but straight up would seem the simplest route. Do you think 6' of pipe inside and 6' above the roof will provide adequate draft using 6" chimney? Any thoughts/advice is appreciated.

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Post Sat. Feb. 01, 2014 2:18 pm

I would think it would be OK. Many on this fourm think stainless pipe is no good however, my 6" metalbestos chimney is about 20 years old and is about ready to be replaced. It has always vented either wood exhaust or soft coal exhaust so I cannot say it will last if its venting anthracite exhaust.

Wood and soft coal both deposit a somewhat oily substance on the inside of the flue so this might be the reason my chimney has lasted.

My preference would be to go straight up through the ceiling that way you only have one penatration of the house and if the stove is ever replaced in the future it will be easier to hook another stove up, even if its a top venting stove.

Also don't forget to install guy wires or the roof braces sense there will be so much pipe above the roof. I have seen them get messed up by the wind.

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Post Sat. Feb. 01, 2014 2:22 pm

Through the roof straight up. Easier faster and cheaper. Betterdraft too.

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Post Wed. Feb. 05, 2014 10:45 am

Straight up... for sure.
The 6" is really minimal size for that stove, the 90's would affect the draft even more..


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Post Wed. Feb. 05, 2014 11:25 am

I have had both out-the-side and through-the-roof.
Out-the-side is UGLY with a capital U.
I think 12 feet total is minimal. Might be OK, might not. I'd stick another 3- or 4-foot piece on top.

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