WELLAND 4x10 White Oak Wood Flush Mount Floor Register Vent Unfinished, 3/4 Thickness Fits a duct size opening of: 4" x 10" (4" x 10" Does not refer to outside dimensions) Made of Unfinished Solid White Oak Louvered Wood Vent APPLICATION - Wall registers; Wood registers; Air registers; Heat registers; Register covers Flush-mount vent sits flush with 3/4" wood floor