14" X 8" [Duct Opening] 3-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 15.75"W X 9.75"H] Color_Anodized Aluminum + Product Details Size –

+ Product Details Size – 20"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 30 5/8" height

actual front end outer dimensions are approximately 12 5/8" width X 22 5/8" height

actual front end outer dimensions are approximately 38 5/8" width X 32 5/8" height -

and installation is quick and simple with the included screws

14" X 8" [Duct Opening] 3-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 15.75"W X 9.75"H] Color_Anodized Aluminum + Product Details Size –+ Product Details Size 14"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are 15. 75" width X 9. 75" height. Design Individually adjusting curved blades. Multi shutter damper with handle operator to adjust air flow. 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