14" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 32 5/8"] Adjustable Return + Product Details Size – Product Details Size 30 LO1828 12in diameter

+ Product Details Size – 12"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 20 5/8" width X 12 5/8" height

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

14" X 30" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 16 5 8" X 32 5 8"] Adjustable Return + Product Details Size – Product Details Size 30 LO1828 12in diameter + Product Details Size – 12"w X 16"h is the size for the duct opening measurement only + Product Details Size 40"w X 20"h is the size for the duct opening measurement only