12" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 36"w X 26"h is the size for the duct opening measurement only

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

+ Product Details Size - 4"w X 36"h is the size for the duct opening measurement only

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is fireproof and ensures efficient thermal performance

12" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 36"w X 26"h is the size for the duct opening measurement only + Product Details Size 25"w X 25"h is the size for the duct opening measurement only