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The garage should be kept well ventilated in order to guard against: 1.fire 2.carbon monoxide poisoning3. carbon dioxide poisoning 4. heat loss

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The answer would be 2, Carbon Monoxide poisoning. It is an invisible gas that can easily build up in a non-ventilated area and is a primary gas in car exhaust, making it a danger in a garage. It is poisonous.
User Adorablepuppy
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. Carbon monoxide poisoning 
User Maurycy
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