18" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 20 5/8"] Color_Black + Product Description Upgrade your 4 X 12 Is CRFG2028 Width_14in

+ Product Description Upgrade your HVAC system with a high-quality aluminum return grille designed for a clean

+ Product Details Size - 16"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 34"h is the size for the duct opening measurement only

they seamlessly integrate into your space

+ Product Details Size – 24"w X 6"h is the size for the duct opening measurement only

18" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 20 5 8" X 20 5 8"] Color_Black + Product Description Upgrade your 4 X 12 Is CRFG2028 Width_14in + Product Description Upgrade your HVAC system with a high quality aluminum return grille designed for a clean + Product Details Size 16"w X 18"h is the size for the duct opening measurement only