14"W X 14"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 15.75"W X 15.75"H] 8" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 30 5/8" height

actual front end outer dimensions are approximately 20 5/8" width X 38 5/8" height -

+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only

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

14"W X 14"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 15.75"W X 15.75"H] 8" Diameter actual front end outer dimensions+ Product Details Size 14"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are 15. 75" width X 15. 75" height. Design Individually adjusting curved blades for better air flow control. Screws Included High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a luxurious touch to any home.