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] Black Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 15 3/4" x 1"

and yet lightweight and easy to handle

Vertical blades in the back

The vent also has a bug screen to eliminate pest intrusion

actual front end outer dimensions are approximately 27 5/8" width X 20 5/8" height

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] Black Actual Filter Size – 33+ 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