Our 173 series is a Stamped Return Air Grille with 1/3 in fin spacing used for sidewall or ceiling openings. Our product is constructed to ensure maximum airflow and compliment your home decor. Using our return air grille to outfit your ventilation system will improve your home air circulation. This product is powder coated white and made of high quality steel. TRUaire™ Return Air Grille, 1-Way Stamped Face, Series: 173, 24 x 24 in, 25-3/4 in Overall Width, 1/4 in Overall Depth, 1946 cfm, 2.775 sq-ft, 1/3 in Blade Spacing, Steel, Pristine White Powder Coated, Import