
10/20/05, 09:11 AM
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Join Date: Jan 2004
Location: WI
Posts: 2,180
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I have always used a section of Metalbestos or similar insulated stovepipe to go through a combustible wall. The makers of the pipe also make sheets of metal with a proper sized hole for the pipe that are designed to go on each side of the wall to support the pipe and maintain the proper space to combustibles. Even with the Metalbestos or similar pipe, the distance required is usually 6 inches, so the hole in the wall needs to be 6" (inside pipe dia)+ 2" (2x wall thickness of insulated pipe--might be greater) + 12" (2 x 6" distance to combustibles) or a total of at least 20"--so the 22 1/2 inches between common studs space 24"oc is just about right.
If common single wall pipe is used instead of insulated the distance to combustables is usually at least 16", so the hole in the wall would be a minimum of 38" in dia.
Of course, these distances are those often required to meet building codes or insurance requirements and are based on tests and history of fires, and can be ignored if you don't care if your house burns down at some unexpected future time.
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