10"w X 10"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: 11.125" X 11.125"] w12h12 + Product Details Size –

+ Product Details Size – 12"w X 18"h is the size for the duct opening measurement only

and keep the cold air out during the Winter Months

+ Product Details Size - 10"w X 10"h X 2"d (for duct opening measurement only)

Premium Airflow Efficiency - High-performance cube core eggcrate design allows 95% airflow efficiency

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

10"w X 10"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: 11.125" X 11.125"] w12h12 + Product Details Size –+ Product Details Size 10"w X 10"h Is The Size For The Duct Opening Only, Dimensions With Outer End are 11. 125" X 11. 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