Antique Cast Iron Louvered Heating Grate Vent Register Ornate Fits a 9” x 12” Hole but the flange makes it wider and longer please look at my pics that show the specs on sizes. Overall it is around 1 3/4” thick and the louvers work perfectly ! Needs cleaned as it was just salvaged from a turn of the century home. No flaws like cracks or breaks to the cast iron, was upstairs so but just surface rust. Could use some paint!