12" X 4" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 13.75"W X 5.75"H] w10h10 Experience enhanced indoor comfort with

Experience enhanced indoor comfort with our 8" Radial Damper

Designed with two mounting base options—solid and ring—it offers flexible installation

these heavy-duty louvers are ideal for use in attics

Heavy Gauge Steel

12" X 4" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 13.75"W X 5.75"H] w10h10 Experience enhanced indoor comfort with+ Product Details Size 12"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are 13. 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