Colemancooler wrote:I am a HVAC professional and I have no idea what "building waste air" is, in regards to the inflatable shelter
I think you would call exhaust air. The problem is most of that air is not safe to breath for a long period of time. It can be full of carbon monoxide from idling engines, or stoves and gas burners. Probably not a good idea to sleep under a plastic tube full of it. Tom