6" X 6" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 7.75"W X 7.75"H] Fixed Blades + Product Details Size -

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

+Why Hvac Premium HVAC Premium has been providing superior quality service for many years

+ Product Details Size – 28"w X 22"h is the size for the duct opening measurement only

The design eliminates noise and prevents louvers from vibrating

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

6" X 6" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 7.75"W X 7.75"H] Fixed Blades + Product Details Size -+ Product Details Size 6"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are 7. 75" width X 7. 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