14" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 16 5/8" X 26 5/8"] Powder Coated + Product Description This aluminum

+ Product Description This aluminum flex duct is intended to be used in heating

Pressure rating: 2300 to 6500 psi

but still very thin

background-color: #5296DD

+ Product Details Size - 28"w X 18"h is the size for the duct opening measurement only

14" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 16 5/8" X 26 5/8"] Powder Coated + Product Description This aluminum+ Product Details Size 14"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 26 5 8" height Actual Filter Size 13 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.