• From Albert at 12/17/12 9:43 PM
  • I plan to run this telescoping pipe horizontally about five feet between two 90 degree elbows. The first elbow will be attached to a two foot vertical pipe inserted into the top vent of an Oakwood wood stove. The second elbow will be attached to a 12 inch long pipe attached to the support box for a Duravent triple wall chimney.
    
    First question. Is there enough wiggle in these elbows to attain the recommended 1/4 inch per foot slope toward the stove?
    
    Second question. This pipe needs to go through a combustible 2x12 interior wall which is midway between the stove and the chimney. I have a framed an open window 32" wide and 30 inches high through which the pipe will pass through. This is unorthodox and not recommended however there are two university extension publications (U of M, and U of D) that show how to safely take a stove pipe through a combustible wall. My insurance company said if I can provide a professional certification of the installation then they may underwrite it. My plans at this time are to run the 6" double wall pipe through the middle of an 18" long 8" or 10" diameter insulated chimney pipe that will serve as a wall thimble. There will be plenty of clearance around the chimney pipe between it and combustible material (> 6 inches). An 18 inch long chimney pipe section will extend 3 inches on either side of the wall into the respective rooms. The stove pipe will be placed in the center of the chimney pipe so that there is air space between them (1/2 inch or so) and the air will be free to flow through the pipe thus ventilating and cooling it naturally.
    
    The chimney pipe wall thimble will be supported by large hole in a 36" x 36" sheet metal that is fastened to the wall on the stove side and which will cover the large opening in the wall. The stove is in a large living room (man cave) in the basement, and teh chimney support box is in a utility room which may be converted to a small bathroom.
    
    Any thoughts about the safety of this design and my chances of getting it approved?
    
    
  • In regards to your first question, the 90 degree elbows are a true 90 degrees so there will not be any slope. As far as the installation of your venting the method you are using is not the method of a typical installation. You would have to contact your local housing authority to get a list of codes that must be followed in your area.
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