6"W X 6"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 7.75"W X 7.75"H] w18h18 + Product Details Size –

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

pair it with our butterfly dampers

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Solid Base for Stability – Built with a solid base for reliable mounting and stability

no scuff powder coat durable finish

6"W X 6"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 7.75"W X 7.75"H] w18h18 + 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 approximately 7. 75" width X 7. 75" height. Design Rigid gauge ABS plastic. Rigid gauge built for durability and long life in mind, but still light and handy. Powder coat finish. Smooth, scratch resistant, beautiful. Looks like new after years of use. Screws Included High Quality High quality ABS plastic will never rust, no sharp