Carbon Monoxide
tasteless, odorless, invisible

Two employees talking. Dialog: Carbon monoxide is not your friend. Huh? No really, it is a killer. With only 1.28% carbon monoxide in the air, death occurs within 3 minutes. I can last 3 minutes. No, everyone is dead before 3 minutes, some after 60 seconds, but all within 180 seconds, including you.

Carbon Monoxide (CO) can kill before you even know it's there. Get a detector and change the batteries twice a year. Death by omission is embarrassing.

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Two employees talking. Dialog: Carbon monoxide is not your friend. Huh? No really, it is a killer. With only 1.28% carbon monoxide in the air, death occurs within 3 minutes. I can last 3 minutes. No, everyone is dead before 3 minutes, some after 60 seconds, but all within 180 seconds, including you.