Thanks everyone for the feedback!
Each door has a 1/2 to 3/4 inch opening at the bottom. guzzy - could you send me the code that you know or for the 1 inch minimum?
I chatted with our HVAC installation guy and he said there is absolutely no concern as long as there are vents and cold air returns in the common areas, which there are. For sanity sake, I may pick up an air quality detector that includes C02 detection.
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