24"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 25.25"W x 5.25"H] 8" Diameter + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 16" OR 16" x 36" duct opening (measured at the opening)

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 10" X 6" X 7"

+ Product Details Outer dimensions: 11

+ Product Details Size – 24"w X 6"h is the size for the duct opening measurement only

crafted from thick and durable galvanized sheet metal

24"W X 4"H [Duct Opening] Linear Aluminum Clip On Bar Return Air Grille [Outer Dimensions: 25.25"W x 5.25"H] 8" Diameter + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 36" x 16" OR 16" x 36" duct opening (measured at the opening) + Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 10" X 6" X 7"