I would use steel pipe with threaded connections, you can get various lengths at Home Depot. Or have a muffler shop bend it up for you, I work at a company that makes exhuast for big trucks so I lucked out on mine. I don't know if you could get copper big enough to flow the volume of air needed. Mine is 2 1/4 inch.  
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Jeff Phillips
Silver Moon Forge
"Perfection is easier to expect, than it is to achieve"
Last edited by unkle spike; 07-26-2008 at 07:17 AM.
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