8" X 4" [Duct Opening] 3-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 9.75"W X 5.75"H] ceiling our Butterfly Damper simplifies the

our Butterfly Damper simplifies the process of managing airflow

The vent also has a bug screen to eliminate pest intrusion

actual front end outer dimensions are approximately 22 5/8" width X 42 5/8" height

Slots are angled to diversify the airflow in 2 way direction

Optional Butterfly Damper Available At Asin: B007CNEL1W

8" X 4" [Duct Opening] 3-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 9.75"W X 5.75"H] ceiling our Butterfly Damper simplifies the+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are 9. 75" width X 5. 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