12"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] 10" Round Duct Pipe + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 8"w X 24"h is the size for the duct opening measurement only

Crafted meticulously from high-quality steel

actual front end outer dimensions are approximately 16 5/8" width X 28 5/8" height

These are airflow control components made to connect to supply grilles of the drop ceiling

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

12"w X 6"h [Duct Opening] 3 Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] 10" Round Duct Pipe + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 8"w X 24"h is the size for the duct opening measurement only Crafted meticulously from high quality steel