25" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 27 5/8" X 26 5/8"] Adjustable Return actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 36 5/8" width X 36 5/8" height

+ Product Details Size – 16"w X 28"h is the size for the duct opening measurement only

Design – These are specially sized to fit into all drop ceilings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

actual front end outer dimensions are approximately 26

25" X 24" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 27 5 8" X 26 5 8"] Adjustable Return actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 36 5 8" width X 36 5 8" height + Product Details Size – 16"w X 28"h is the size for the duct opening measurement only