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The oxygen depletion sensor does not give you any indication of the presence of CO (carbon monoxide). For that you need a CO detector. And not a CO2 detector.
Exactly! I use a portable co (Carbon Monoxide) detector with my Big buddy and it has never given me a warning or even shown traces. I always keep the roof vent open and at least one window or door open a little on the 6X12 and or 6X6 pop up shelters. Wood heat is nice but would be a pain in the a.. when you are trying to run and gun and keep weight and bulk to a minimum.
My suggestion is try to find a direct vent propan heater.. like this at link it mounts to a out side wall and vents Co. out side. I like that would be the way to go
The big buddy is supposed to shut itself off if there is a problem.Dont know if I would trust it though.