New Chimney for Mark III

New Chimney for Mark III

PostBy: david78 On: Thu. Jan. 30, 2014 9:13 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.
Baseburners & Antiques: Fuller & Warren Splendid Oak 27
Coal Size/Type: Nut

Re: New Chimney for Mark III

PostBy: carlherrnstein On: Sat. Feb. 01, 2014 3:18 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.
Hot Air Coal Stoker Stove: combustioneer model 77B
Coal Size/Type: pea stoker/Ohio bituminous

Re: New Chimney for Mark III

PostBy: franco b On: Sat. Feb. 01, 2014 3:22 pm

Through the roof straight up. Easier faster and cheaper. Betterdraft too.
franco b
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: New Chimney for Mark III

PostBy: Chuck_Steak On: Wed. Feb. 05, 2014 11:45 am

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

Coal Size/Type: mostly nut, sometimes stove, Santa brand
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark III

Re: New Chimney for Mark III

PostBy: rberq On: Wed. Feb. 05, 2014 12:25 pm

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.
Hand Fed Coal Stove: DS Machine 1300 with hopper
Coal Size/Type: Blaschak Anthracite Nut
Other Heating: Oil hot water radiators, propane