20"w X 20"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: 21.125" X 21.125"] Compatible with Duct 8" [Outer Dimensions: 26

[Outer Dimensions: 26

+ Product Details Size – 4"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

Design – This airflow control component are made to connect to HVAC diffuser and restrict airflow

+ Product Details Size – 14" x 32" or 32" x 14" is the size for the duct opening measurement only

20"w X 20"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: 21.125" X 21.125"] Compatible with Duct 8" [Outer Dimensions: 26+ 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