Accord ABSWWH488 Sidewall/Ceiling Register with 4-Way Design, 8-Inch x 8-Inch(Duct Opening Measurements), White Steel construction for sidewall or ceiling application 1/2-in spaced fins Four-way air deflection with a multi-shutter damper The number of louvered columns and mounting holes will vary based on the size of the grille ordered Listed product sizes refer to the duct opening measurements, not the register itself