Hart & Cooley 657 Series 30" x 6" White Baseboard Return Air Grille (Fits a 30" x 6" Hole) Designed to cover a 30"W x 6"H hole in the wall Overall dimensions measure: 31-3/4"W x 7-3/4"H Bright white enamel finish; One-piece steel construction 1/3" spaced fins set at 20 degrees; 7/8" margin turnback