I have read most of the previous postings regarding CO, and have come to the conclusion that whatever fuel you burn indoors, ie: alcohol, propane, butane, Sterno, or kerosene, that you will be consuming O2 and producing at least some water vapor. I am looking at a "shelter in place" scenario and a propane fired grill (or Coleman stove) sitting on the stove or kitchen counter. If the total room volume is large enough, it should be OK, right?? Certainly the little propane stove in a camper/trailer will not kill you if you have a good fresh air (oxygen) source, but does propane really produce CO in and of itself?? (Like BBQ briquets?) We almost lost a family of six in our neighborhood several years ago who brought the BBQ "part way" into the house, thinking that the heat would come in and the "bad" gasses would go out. Thanks