18" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed HInged - [Outer Dimensions: 20 5/8" X 22 5/8"] White + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 36"w X 16"h is the size for the duct opening measurement only

/* Adding space between bullet points */ } li { margin-bottom: 15px

+ Product Details Size - 24"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

polished appearance that adds elegance to any room

18" X 20" Steel Return Air Filter Grille for 1" Filter Fixed HInged [Outer Dimensions: 20 5 8" X 22 5 8"] White + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 36"w X 16"h is the size for the duct opening measurement only * Adding space between bullet points * } li { margin bottom: 15px