I had an HVAC contractor in about adding a 2nd air return in the basement, and I am unsure if what he suggested is fine, or if it was simply the easiest.
He suggested using the wall cavity to bring it down to the floor, then running a 6" or 7" duct (tbd) back to the main plenum. I am concerned the grill, although in the hall, is next to the utility room door. Does that present any issues? The door would, of course, always be closed and the utility room is a fair size. I just wanted second thoughts on if it could pull air incorrectly or not (ie back from util room). If there is no issue there, the location is otherwise great.