Most houses have enough area and enough random air circulation that a fermenting batch isn't a problem. It takes 3% CO2 to be harmful and you'll all have headaches long before that anyway. A small closed room is a different case, so don't lock your kid in the bathroom with an active ferment.
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Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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