Triangular Baseboard Floor Register (14" x 6" Duct Opening) Triangular white baseboard diffuser for a 14" x 6" duct opening Solid steel construction with a plastic tab on lever for comfort Outside dimensions: 15 3/8" width x 6 7/8" height x ~3 3/4" base projection with 7/8" top projection Comes with a plate damper with 1/3" spaced fins Sizing is based on the size of the duct opening it fits NOT the outside dimensions