18"W X 18"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 19.75"W X 19.75"H] w16h16 + Product Details Size –

+ Product Details Size – 8" x 24" or 24" x 8" is the size for the duct opening measurement only

+ Product Description When it's time to upgrade your HVAC Vents in your house

The integral multi-shutter damper with a convenient handle operator ensures that you can easily adjust the air volume

+ Product Details Size - 26"w X 32"h is the size for the duct opening measurement only

+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior strength and durability

18"W X 18"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 19.75"W X 19.75"H] w16h16 + Product Details Size –+ Product Details Size 18"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are 19. 75" width X 19. 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.