I’m finishing our basement and I’ve just added 6 new runs throughout the basement. My question is; should I move the return air vent down? The builders just put in a 14”x14” roughed in on the ceiling by the furnace. It’s my understanding that return air should be close the the floor. I’ve thought about punching a hole in the side of the return duct at the floor of the utility room and capping the existing duct. Thoughts?