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If one uses a vent-free gas log in a fireplace during a power outage in the winter with the chimney flue closed as recommended, what protects the household from CO buildup and poisoning?

April 26, 2017chimney fireplace flue Gas log outage power uses vent-free winter

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If one uses a vent-free gas log in a fireplace during a power outage in the winter with the chimney flue closed as recommended, what protects the household from CO buildup and poisoning?

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The ODS (Oxygen Depletion Devise) does not require power to operate. It will shut off the gas to the appliance when the oxygen in the room drops from 20.9% to 18%. This is a long ways from harmful levels of CO.