28" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 26 5/8"] 18" Round Duct Pipe + Product Description Enhance your

+ Product Description Enhance your ventilation system with our high-quality grilles and registers

+ Product Details Size – 8"w X 14"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 16" duct opening (measured at the opening)

+ Product Details Size – 14"w X 20"h is the size for the duct opening measurement only

28" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 26 5/8"] 18" Round Duct Pipe + Product Description Enhance your+ Product Details Size 28"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 30 5 8" width X 26 5 8" height Actual Filter Size 27 3 4"w x 23 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.