Anything that's not a reliable fuel fired device. The leakage all around a garage door plus the cubic volume of the double auto garage ought to deliver an adquate offer of combustion air to any "B" vented device. Incidentally, I emailed them to remove my info from their site at https://rylanygou52952.daneblogger.com/33821428/the-ultimate-guide-to-garage-ceiling-lifts-maximizing-space-and-convenience