1 90 or 2-45's

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Post Thu. Nov. 22, 2007 3:28 pm

I was reading another post Smoke Rolls Out Load Door - Any Advice?. Will 2-45 degree elbows give me a better draft than 1-90? I have a top vent with about 18" vertical before the 90 & a "T" for the baro & then right to the thimble. Not to much pipe. Thanks.
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Post Thu. Nov. 22, 2007 8:43 pm

I subscribe to the least amount theorey. The least amount of pipe, elbows, angles and thimble pipe. If you have a great chimney, it really doesn't matter if you have a few turns. A poor one can make life difficult.
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Post Fri. Nov. 23, 2007 7:28 am

I don't think it would affect it that much, I would think the straighter the pipe, the better airflow and draft, also, I read somewhere, that Elbows, TEE, etc.. add "XX" in equivalent pipe length. (ie. 90 Deg. Elbow is equal to 10 feet of straight run? or something like that)
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Post Fri. Nov. 23, 2007 12:39 pm

Actually two 6" 45* Els would have slightly less loss than a single 90* EL. The cost however, does not make this worth it. :)

Forgot the ratios on the table, they are 1/4, 1/2 and 3/4 going down from the top row for d/D.
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