20" X 14" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 16 5/8"] Color_Black Achieve the perfect airflow with 4 X 12 Is CRFG2028 Width_14in

Achieve the perfect airflow with adjustable control by rotating the middle disk

+ Product Details Size – 12" x 30" or 30" x 12" is the size for the duct opening measurement only

+ Product Details Size - 36"w X 18"h is the size for the duct opening measurement only

Efficient Airflow Design: The slots are meticulously angled to diversify airflow in two directions

85" width X 21

20" X 14" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 22 5 8" X 16 5 8"] Color_Black Achieve the perfect airflow with 4 X 12 Is CRFG2028 Width_14in Achieve the perfect airflow with adjustable control by rotating the middle disk + Product Details Size – 12" x 30" or 30" x 12" is the size for the duct opening measurement only