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Are these things dangerous in a tightly closed building? I was helping a friend put the wings on his airplane yesterday in his very tight hangar. 30 degrees so we fire up an 85,000 BTU heater. After about an hour I became real dizzy and light headed. We turned off the heater and opened a door and after 15 minutes I felt fine.


Can these heaters seriously lower the oxygen concentration or put out CO? Being at 5100 feet probably doesn't help.


Jack


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