Death from CO in Non-Fire Situations:

Dangers from Small Engine Exhaust in Confined Spaces (ie. volumes):

Fig. 1 - CO concentration measured inside a 2,332 cu. ft. bathroom with a 5 hp. concrete saw operating (doors open, cooling fan and ventilation running).	Fig. 2 - Calculated CO concentration generated by a 5 hp., 4 cycle gasoline powered engine operating in a 1,000 cu. ft. room, having various air changes per hour (ACH).
Fig. 3 - Calculated CO concentration generated by a 5 hp., 4 cycle gasoline powered engine operating in a 10,000 cu. ft. room, having various ACH.	Fig. 4 - Calculated CO concentration generated by a 5 hp., 4 cycle gasoline powered engine operating in a 100,000 cu. ft. room, having various ACH.

Ref. Earnest, G.S., et al. (1997) Carbon monoxide poisonings from small, gasoline-powered, internal combustion engines: Just what is a "well-ventilated area"? Am. Industr. Hyg. Assoc. J., 58, 787-791.