Hart & Cooley 657 Series 30" x 10" White Baseboard Return Air Grille #043672 (Fits a 30"W x 10"H Hole) IMPORTANT: Designed to cover a 30" x 10" hole IMPORTANT: Overall dimensions are 31-3/4"W x 11-3/4"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