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I have a question it may be a dumb one but can u use a white pvc pipe that is used for a high affiance furnace I think that it will take a fair amount of heat but just wonder if anyone has used it to0 introduce the smoke to the box
Most plastic pipes have the temp rating stamped on them so yoI should be able to look at a piece and see if it would work. I used dryer duct for mine because it is cheap and rated for higher temps.
sounds good it is something I never thought of just had this white pvc furnace piping kicking around but I think I have some dryer piping laying around as well Thanks for the info I may get the muffler shop to bend me a piece to fit the hole