12"W X 8"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 9.75"H] return filter actual front end outer dimensions

actual front end outer dimensions are approximately 14 5/8" width X 30 5/8" height

The total outer size of this grille is the listed size plus 1

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

+ Product Details Size – 12"w X 26"h is the size for the duct opening measurement only

Commercial Grade Aluminum - Will Never Rust - Designed for Warehouses

12"W X 8"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 9.75"H] return filter actual front end outer dimensions+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are 13. 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