18"w X 18"h Extruded Aluminum Adjustable Core Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 19.125" X 19.125"] Color_Red Oak Wood + Product Details Size –

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

High Quality – high-quality steel with counter-sunk screw holes (screws included) and no sharp edges

Durable Construction – Made from high-quality

[Outer Dimensions: 26

18"w X 18"h Extruded Aluminum Adjustable Core Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 19.125" X 19.125"] Color_Red Oak Wood + Product Details Size –+ Product Details Size 18"w X 18"h Is The Size For The Duct Opening Only, Dimensions With Outer End are 19. 125" X 19. 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