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Combustion appliances in garage


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Another head scratcher for me: suppose the math shows the appliances need 4500 cubic feet of air and there's about 4700 cubic feet of air in the garage but the garage is confined. Is that acceptable?

I wouldn't worry about it. I doubt any garage door would produce an ideal air seal when it's in the closed position because there's no need for anyone to manufacture such a model. Who air conditions the garage? The drafts will likely provide enough combustion/dilation/ventilation air, unless it is a 199,000 btu/hr on-demand unit.


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