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Do you need vents with a gas water heater?

6 years ago
I just noticed that my husband taped shut all the exterior vents on our garage doors because he thought it would keep the house warmer. Our gas water heater is in the garage and I always believed you must have fresh air circulation in the garage because of fumes or co2 from heaters ect. We currently do not have vehicles in the garage but do keep things like the lawn mower, trailer, paint, power tools...

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