12"W X 12"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 13.75"W X 13.75"H] Powder Coated + Product Details Size –

+ Product Details Size – 30"w X 36"h is the size for the duct opening measurement only

Actual Filter Size – 25 3/4"w x 11 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 4" duct openings

actual front end outer dimensions are approximately 32 5/8" width X 28 5/8" height

excluding the old vent cover

12"W X 12"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 13.75"W X 13.75"H] Powder Coated + Product Details Size –+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 13. 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