Jan 12, 2012 #1 Codes never permit duct openings in a household attached garage, for noticeable motives. I ran across just one yesterday in which it seems that the contractor is putting an air handler inside of a garage beneath living Room. My to start with response is -not permitted- https://garagestoragelift65208.mywikiparty.com/1454098/how_much_you_need_to_expect_you_ll_pay_for_a_good_garage_ceiling_storage_lift