14" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 30 5/8"] flat stamped steel + Product Details Size - Sheet Metal RG2016 FBA-HP actual front end outer

+ Product Details Size - 24"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – 26"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 4"h is the size for the duct opening measurement only

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Actual Filter Size – 17 3/4"w x 27 3/4" x 1"

14" X 28" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 16 5 8" X 30 5 8"] flat stamped steel + Product Details Size Sheet Metal RG2016 FBA HP actual front end outer + Product Details Size 24"w X 36"h is the size for the duct opening measurement only + Product Details Size – 26"w X 14"h is the size for the duct opening measurement only