#11  
Old 03-13-2013, 09:50 AM
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Default Re: Keystone Size

No harm in using mortar to seal it up and lock everything in place. The rest of the construction uses mortar, no reason to stop on the last piece.
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  #12  
Old 03-13-2013, 10:25 AM
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Default Re: Keystone Size

Yeah, you want to use mortar on the keystone just like the rest of the dome. That's what holds the bricks apart to give your dome structural integrity. Plus, it keeps the smoke and heat inside, which is kinda nice
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  #13  
Old 03-13-2013, 10:43 AM
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Default Re: Keystone Size

Ok guys running into sort of a dilema designing my vent. Since my oven is 40" dia. I need an 8" dia. steel chimney. Well I'ld like to make mine out of clay flue liner which is 8"x 12". I was told that the 8"x12" has the same draw as an 8" dia. steel chimney. Others I believe have taken the 8x12's and cut them to be 8x8??? Is that enough size for correct draw?
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  #14  
Old 03-13-2013, 11:16 AM
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Default Re: Keystone Size

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)
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Old 03-13-2013, 11:27 AM
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K79 K79 is offline
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Default Re: Keystone Size

Quote:
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)
Ok, so an 8x8 clay flue liner will work. So I need to reach at least 30.58 SqIn for my vent opening as well? A little confusing when most try and reach somewhere between 40 and 50 sq in.
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Old 03-13-2013, 11:51 AM
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Default Re: Keystone Size

What size is your inner arch opening?
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  #17  
Old 03-13-2013, 12:01 PM
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Default Re: Keystone Size

Not exactly sure yet, I don't know how I'm gong to build it. A complete arch or one like the image below. I'm leaning towards the one one in this image.

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  #18  
Old 03-13-2013, 12:13 PM
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Default Re: Keystone Size

Well, if you built that one, it would be 225.8 SqIn, so you would need a minimum of 33.87 SqIn of draw, and really more would be better unless you plan on a tall stack.
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  #19  
Old 03-13-2013, 12:17 PM
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Default Re: Keystone Size

I have 235sqin so if I go somewhere between 35 and 40 sqin for my vent opening I should be ok.

What are your thoughts on the arch itself? I was thinking of a 36" stack... too tall? I'ld love to be able to do it a little smaller.

Last edited by K79; 03-13-2013 at 12:25 PM.
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  #20  
Old 03-13-2013, 12:42 PM
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Default Re: Keystone Size

Then use an 8" round metal flue, that gives you 50.26 SqIn. 36" is a short stack, so the extra will help.
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