These TruAire heavy gauge all steel floor grills will be perfect for your home. Allowing over 75% free flowing air this assures ample air return to your furnace or excellent flow of air into any room. As this is meant for free-flowing air this grill does NOT come with a damper to control air flow. The non-scuff brown powder coating is put on all parts before assembly of the finished product insuring 100% coverage of all the steel parts. There is no need to worry about issues with humidity. This item is made for a hole in the floor and can NOT be used on the wall. The excellent rigidity assures no one will break through this grill while walking on it. To ensure a proper fit be sure to measure the hole in the floor NOT the old grill. Made for an 10 x 30 floor hole the overall faceplate size is 11 ¾” x 31 ¾”