20"w X 20"h Extruded Aluminum Adjustable Surface Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 21.125" X 21.125"] w25h25 Design – Equipped with lever

Design – Equipped with lever for full airflow control

+ Product Details Size - 34"w X 28"h is the size for the duct opening measurement only

and the included installation screws make setup simple and efficient

actual front end outer dimensions are approximately 30 5/8" width X 22 5/8" height

+ Product Details Size – 25"w X 26"h is the size for the duct opening measurement only

20"w X 20"h Extruded Aluminum Adjustable Surface Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 21.125" X 21.125"] w25h25 Design – Equipped with lever+ Product Details Size 20"w X 20"h Is The Size For The Duct Opening Only, Dimensions With Outer End are 21. 125" X 21. 125". Design Re configurable Interchangeable Sections Easily convertible into 1 Way, 2 Way, 3 Way, or 4 Way Just lift sections and rotate to re configure direction. High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds