That high altitude oxygen deprivation test I would have failed, I am an O2 sensor :lol: I get bad dizzy if some one is running a torpedo style heater, everyone there don't have a problem with it.. about 45 years ago I had supper at a girls house I was dating and I got dizzy and stood up and about fell to the floor, turns out there heat chamber on there wall heater had a combustion chamber leak, and there grandmother has been sick for a couple months, turned out to be the bad heater , yep, no flying for this man