WELLAND 2 x 10 Inch Maple Wood Self Rimming Floor Register Vent Unfinished Fits a duct size opening of: 2" x 10" (2" x 10" refers to the back insert measurement) Made of Unfinished Solid Maple Wood Self Rimming vent (aka Insert Vent), Louvered Wood Design 3/4 inch thick See the details at the bottom of the page.choose the right size Please Read Carefully Refer To The Dust Openings is 2&#034; x 10&#034; Measure the size of the duct opening. Do not measure your current floor register. Fits a duct size opening of: 2&#034; x 10&#034; you must measure the size of the duct opening