Jerry Simon Posted February 20, 2004 Report Share Posted February 20, 2004 Furnace "B" vent was about 1/8" away from a 4" PVC waste pipe....thoughts? Thanks! Quote Link to comment Share on other sites More sharing options...
kurt Posted February 20, 2004 Report Share Posted February 20, 2004 Peoples Gas is now 1" minimum to combustible(s). Most mfg's. say 2" minimum. Do you consider PVC combustible? I'm not sure. I do know if you burn the stuff, it's poison gas, very bad. Quote Link to comment Share on other sites More sharing options...
Brian G Posted February 20, 2004 Report Share Posted February 20, 2004 By the book, 1 inch clearance needed. Real world, it depends. The farther away from the furnace you get the less heat there is coming through the walls of the pipe (generally). How long has it been there? Any signs the PVC has been hot? Brian G. Quote Link to comment Share on other sites More sharing options...
Jerry Simon Posted February 20, 2004 Author Report Share Posted February 20, 2004 Brian & Kurt...thanks...my thoughts exactly...I don't know if PVC should be considered combustible (though I know it'll burn)...so I wrote it up as Brian said (by the book)...& I mentioned that toxic gas part. NO signs of overheating...home was 5 years old. Kurt, I think PVC is now allowed in Chicago....wasn't for years...I heard because the thought was if it was burning, it gives off that toxic gas. Wasn't real reason the plumbers union (takes longer to assemble cast)??? Guess someone realized if the plumbings burning, there's other, bigger problems. Quote Link to comment Share on other sites More sharing options...
E. Burns Posted February 20, 2004 Report Share Posted February 20, 2004 Is drywall considered a combustible? I quoted the code reference in the gas water heater thread previously. Thanks, Ellen Quote Link to comment Share on other sites More sharing options...
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