8"W X 8"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 9.75"W X 9.75"H] Aluminum Adjustable Curved Blade Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 17 3/4" x 1"

but you will appreciate the benefits over the period of time

+ Product Details Size - 26"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height -

8"W X 8"H [Duct Opening] Never Rust Plastic 4-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 9.75"W X 9.75"H] Aluminum Adjustable Curved Blade Actual Filter Size – 23+ Product Details Size 8"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 9. 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