Vintage White Steel Baseboard Registers - 13" X 12" Outside Dimensions White Powder Coated Steel Gravity Baseboard Vents Gravity vent that fits 13" x 12" overall or a hole at least 10" x 8" This gravity vent has a flap damper to allow maximum air flow Top projection is 1" out from wall and 2.5" out from wall Replace the hard to find and beat up old vent...Finally