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I'm trying to understand concentric venting and I have a few questions. In addition to cooling out-going exhaust gases it seems to me that one benefit of concentric venting is to warm up the incoming combustion air. If this is the case, why is the inner pipe of the system double walled? That...

My hanging garage heater has a 5" exhaust outlet. In theory (disregarding code for a moment) it seems possible to surround my 5" exhaust pipe with a 7" pipe and draw in combustion air between the 2 pipes. I have seen kits for this but they seem very expensive. So here is my question. Why...

Why another one of these? Because most of them do not provide enough information to be useful! If you heat your garage all winter, please provide as much information as possible for your case:Square footage (use sq ft) Wall/ceiling height (use ft) optional Insulated? (yes/no) Wall insulation...