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All these user manuals say to avoid carbon monoxide you should vent indoor spaces, but if you start cracking windows all the cold outside air comes rushing in. So what's the proper way to do this - just barely crack a window 1/2 inch?

All these user manuals say to avoid carbon monoxide you should vent indoor spaces, but if you start cracking windows all the cold outside air comes rushing in. So what's the proper way to do this - just barely crack a window 1/2 inch?

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You're playing Russian Roulette with your life, if you are using a propane heater inside a closed building. Carbon monoxide (monoxide, not dioxide) is a poison gas that replaces oxygen in your red blood cells. The more blood cells the CO deactivates, the less oxygen gets carried to your heart and your brain. You keep breathing, but it doesn't do you any good, and you eventually pass out and don't wake up.