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"] 3-Way or 4-Way + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 8" OR 8" x 20" duct opening (measured at the opening)

Carefully shrink wrapped with cardboard backing to prevent damage in shipment

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

this flex duct decreases the pressure loss and provides a more hygienic environment

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 28" or 28" x 10" duct opening (measured at the opening)

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"] 3-Way or 4-Way + Product Details Perfect Fit+ 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