10" X 10" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] Color_Red Oak Wood + Product Details Size –

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

Installation – Easy to Install

actual front end outer dimensions are approximately 38 5/8" width X 16 5/8" height -

10" X 10" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] Color_Red Oak Wood + Product Details Size –+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are 11. 75" width X 11. 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