Why does Supervent not want me to offset around the eave? Is it because of the decreased draft or support issues with offsetting the chimney? I have a through-the-wall installation and would like to use the 15 degree offset to go around a 12" eave instead of cutting the eave and boxing it in. Is there really going to be an issue if I choose to go this route?
External chimney offset
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The main issue will be voiding the warranty. If they say don't do it, don't. If there is a failure or fire your insurance company may use this as a scapegoat.
M&G Duravent has this offset option for exterior installs and they sell a side brace kit to keep the offset elbows rigid.
M&G Duravent has this offset option for exterior installs and they sell a side brace kit to keep the offset elbows rigid.
Ed Williams
New Member
- Sep 25, 2013
- 28
Most brands of chimney offer the proper parts to do this. We usually offset around the eave, with support right at the offset, then straight up, and use a roof brace kit attached at the top of the pipe, just under the cap, for additional rigidity. If you offset out and then back in, the additional 2 bends can impair your draft. Also, most manufacturers specify the max number of bends. The less bends, the better, especially on an outside chimney, as they often run cool anyway.
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