I didn't know where to post this...it could be laundry, plumbing, hvac.
My utility room houses an electric dryer, gas hot water heater (non powered vent), and newer gas furnace (with external=outside intake/exhaust). The room had a slat door that was tired and I want to replace with something newer. I want to go with a solid door to block some noise to the area right next to the door. I understand I need to let the appliances breathe and am willing to do this with vents elsewhere into the utility room (the room is 30 feet long). I just don't want the vents near the door.
I'm looking for guidelines on how large the vents need to be...and if there are any requirements for high vs low.