If you are concerned about noise, you can build a folded vent into the wall. Open a hole in the wall in the DC closet at 5', then another one in the shop wall down low. This way the return air has to change direction, and that helps to cancel out sound waves. Same principle as a car muffler uses to quiet exhaust noise. Make the opening that is easiest to get to have the filter in it. Jim.
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3