#21  
Old 03-13-2013, 12:47 PM
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Default Re: Keystone Size

I was trying to figure it out building it out of clay flue liner and brick. I couldn't find anyone local that had any ideas on how to run the 8" ss stack out the peak of the roof. Issues with the weather stripping and such. This and cost has pushed me towards the clay option. would 40 sq in work with a 36" stack?
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  #22  
Old 03-13-2013, 01:13 PM
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Default Re: Keystone Size

I do not understand the difference between piercing the roof with double wall pipe or masonry?
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Old 03-13-2013, 01:14 PM
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Default Re: Keystone Size

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Originally Posted by Tscarborough View Post
I do not understand the difference between piercing the roof with double wall pipe or masonry?
I don't either... this is all new to me.
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  #24  
Old 03-13-2013, 01:19 PM
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Default Re: Keystone Size

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Originally Posted by Tscarborough View Post
Square/rectangular flues are measured o.d., while round ones are measured i.d., FYI.

8x8 is a common size for clay flue liners, with 30.58 SqIn of draw: 6.25 (i.d.)/2 gives a radius of 3.12, 3.1416x(3.12x3.12)=30.58. When calculating draw you draw the largest circle(s) that will fit in the area and use that dimension. The area of the flue should be around 15% of the size of the inner opening, and more is better up to a limit.

(the floor size doesn't really matter for draw)
Tscarborough,
Hope im note butting in I'm new to the furum. (More is better to a limit.) What is that limit? I'm thinking of using 8 x 17 flue on a 40 inch oven.
K79 been reading your build looks good.
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  #25  
Old 03-13-2013, 01:25 PM
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Default Re: Keystone Size

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Originally Posted by kbartman View Post
Tscarborough,
Hope im note butting in I'm new to the furum. (More is better to a limit.) What is that limit? I'm thinking of using 8 x 17 flue on a 40 inch oven.
K79 been reading your build looks good.
That seems like a lot. It'll be interesting to see what everyone thinks.
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  #26  
Old 03-13-2013, 02:04 PM
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Default Re: Keystone Size

Basically, the draw would be twice an 8x8, the floor size doesn't matter, what is the inner arch opening size?

They make the flashing for the double pipe penetration, the masonry chase is done with step flashing. In either case you probably want to offset it so that it penetrates a flat plane not the ridge. In my case I made it a shed roof for more protection in front and I didn't want to offset the flues.
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Old 03-13-2013, 02:10 PM
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Cool Re: Keystone Size

I limited to 8" on my depth and the 8" X 17" was one of standard flues stocked at the brick yard,the other were to small or to big. I thought it would work. Now I'm unsure

The other day Utahbeehiver was worried about highjacking someone's thread to answer one of my questions. Is this consider highjacking? Dont want to affend anyone. I need all the help I can get.

Thanks
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  #28  
Old 03-13-2013, 02:25 PM
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Default Re: Keystone Size

Up to the OP on the highjacking, some threads wander all over. That size should be OK, though.
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  #29  
Old 03-13-2013, 02:31 PM
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Default Re: Keystone Size

Thanks,
Tscarborough, OP?
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  #30  
Old 03-13-2013, 05:44 PM
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Default Re: Keystone Size

Original poster, the owner of the thread.
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