10"W X 10"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 11.75"W X 11.75"H] 12" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 28 5/8" width X 10 5/8" height

+ Product Details Size - 18"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 24"h X 2"d (for duct opening measurement only)

Crafted for durability and rust-resistance

Crafted from high-quality red oak wood

10"W X 10"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 11.75"W X 11.75"H] 12" Diameter actual front end outer dimensions+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 11. 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