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chimney flue sizing

B

Bkpigs

Member
Trying to figure what size chimney flue I am going to need. I have an old pot belly stove from my late grandpa. It is a large stove and the opening on the top of the stove is an 8" X 4" i.d. oval. I read somewhere on the internet that the flue needs to be 20% or so larger than the stove opening so I would think it would need to be an 8" flue (an 8" X 4" oval would seem to be about the same as a 6" circle).

Thanks in advance!!
 
The 8 x 4 oval is probably made for a 6" stove pipe. If you build a masonry chimney you could use a 8" square. (nominal) We have had better luck using metalbestos chimneys and go straight up, easier to clean and better draft. I think they are cheaper and certainly easier to install!
 
The 8 x 4 oval is probably made for a 6" stove pipe. If you build a masonry chimney you could use a 8" square. (nominal) We have had better luck using metalbestos chimneys and go straight up, easier to clean and better draft. I think they are cheaper and certainly easier to install!
 
I have a antique wood burning stove called a Round Oak. my stove had a 7 inch oval opening. I got a 7 inch oval to 6inch round adapter, then contunued with 6 inch. I have single wall stove pipe in the room, but where it goes through the wall I have double wall pipe. I think it is clled metal bestos. My stove pipe has two 90 degree ells, and works fine. I have been using it for 25 or so years. I would think your stove will be fine with the 6 inch pipe. Make sure you have enough clearance between the stove and the wall. I put my stove too close to the wall, and the bricks get very hot behind the stove. I had to lay a piece of sheet metal next to the brick wall, to keep the wall cool. Just my two cents worth of info. Stan
 
I have three wood stoves. One of them is a kit using a 55 gallon drum and all use a 6" flue. I don't believe you would need a larger pipe.
 
A 6" flue is plenty adequate for most stoves. I have an old coal burner in my shop that has the oval opening and you'll need the oval to round section to start with. Check at a local stove dealer or they're pretty easy to find online.

Here's one.

http://www.northlineexpress.com/item/5IM-BM0037/6-24-Ga.-Snap-Lock-Black-Oval-To-Round-Boot
 
I had the Super Flue liner installed in my chimney back in 1994. There are no mortar joints where cresote can ooze out if the chimney catches fire. Hal
 
I had the Super Flue liner installed in my chimney back in 1994. There are no mortar joints where cresote can ooze out if the chimney catches fire. Hal
 
I have an "Earth Stove" that came from Burkburnet, TX. that weighed 500# and I put it in my house in 1979. Still using it, maintenance free and until I expanded my house from 1440 ft to 2500 ft it was my only source of heat in the winter, here in N. TX.

The outlet on top of the stove was 8". When I installed it in the house that my wife, kids, and had just built by our own hands, I put in triple wall pipe to the roof and a 3' extension on top of that and a rotating weather head.

Love it and it is running right now, just got her going about an hour ago. My babe is fixing up some left overs from last night, fresh mixed salad, home made potato soup with some left over ham, a little wine, soul music on the Boze, fire going with the grille so you can see the fire, candles, the island we installed in the kitchen last year has one side you serve from and one side you eat from.....side by side.....I'm 70, she's 69. I guess we'll manage ole age some how.

Happy New Year. Life's a beach. Just gotta figure out how to survive it somehow. Grin.

Mark
 
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