10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 18.5"] Return + Product Details Size – CRFG2028 Width_14in 4 X 12 Is

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

Each grille is securely shrink-wrapped with a cardboard backing to prevent damage during shipment

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 30" OR 30" x 28" duct opening (measured at the opening)

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+ Product Details Size – 12" x 24" or 24" x 12" is the size for the duct opening measurement only

10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 12.5" X 18.5"] Return + Product Details Size – CRFG2028 Width_14in 4 X 12 Is + Product Details Size – 26"w X 36"h is the size for the duct opening measurement only Each grille is securely shrink wrapped with a cardboard backing to prevent damage during shipment