16" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 18 5/8"] RV Mobile Home + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only

Design – Designed to withstand bends and sharp turns without kinking

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Powder-Coat Finish - Smooth

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

16" X 16" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 18 5 8" X 18 5 8"] RV Mobile Home + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only Design – Designed to withstand bends and sharp turns without kinking