14"W X 8"H [Duct Opening] Never Rust Plastic 3-Way-Vertical Air Supply Register - HVAC Vent Duct Grille - Off White [Outer Dimensions: 15.75"W X 9.75"H] return filter + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only

+ Product Details Size - 24"w X 12"h X 2"d (for duct opening measurement only)

very easy to do

+ Product Details Size - 30"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 26 5/8" height

14"W X 8"H [Duct Opening] Never Rust Plastic 3 Way Vertical Air Supply Register HVAC Vent Duct Grille Off White [Outer Dimensions: 15.75"W X 9.75"H] return filter + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only + Product Details Size 24"w X 12"h X 2"d (for duct opening measurement only)