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

Actual Filter Size – 23 3/4"w x 9 3/4" x 1"

Crafted from high-quality powder-coated steel

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

+ Product Description Ventilate your home or commercial space with our Aluminum Outdoor Weatherproof Louvers

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