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CPSC and FEMA Warn: When A Storm Knocks Out Power, Don't Risk Carbon Monoxide Poisoning by Using Gasoline-Powered Generators Indoors
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WASHINGTON, D.C. - When disaster strikes and the power goes out, many Americans turn to their gas-powered generators for heat and electricity. But when they set up those generators inside, a second disaster may strike - carbon monoxide poisoning.

The U.S. Consumer Product Safety Commission (CPSC) and the Federal Emergency Management Agency (FEMA) have joined forces to warn residents not to use gasoline-powered generators or charcoal grills indoors or in attached garages because of the risk of carbon monoxide (CO) poisoning. "If you want to use a gasoline-powered generator when the power goes out, set it up outside in a dry area, away from air intakes to the home," said CPSC Chairman Hal Stratton. "And never use a charcoal grill inside because you risk being poisoned by deadly carbon monoxide. Opening doors and windows or operating fans to ventilate is inadequate and unsafe. Even with a CO alarm, you should never use a gasoline- powered generator or a charcoal grill inside. "
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Also see: Portable Generators: How to use them safely!
this is a big one, and should apply to any trapped gasses in any form (no,not flatulence) [Linked Image]

Carbon monoxide will also back up if there's enough snow on your roof and/or vent. One would think it to melt away, but not always so....

Sewer vents also back up this way. There was a home near Stratton that literally blew up last week.

Methane is suspect.....
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