Hart & Cooley 657 Series 20" x 8" White Baseboard Return Air Grille #043660 (Fits a 20"W x 8"H Hole) IMPORTANT: Designed to cover a 20" x 8" hole IMPORTANT: Overall dimensions are 21-3/4"W x 9-3/4"H One-piece steel construction; 1/3" spaced fins set at 20 degrees 7/8" margin turnback; Exceptional free area Install with fins upward or downward for best duct concealment; Bright white enamel finish