6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] Custom Louvers Universal size 4 X 12 Is CRFG2028 Width_14in

Universal size

+ Product Details Size – Duct end cap is 18" X 10" | 26-gauge galvanized steel end cap

This grill comes in four different designs

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 6" duct openings

+ Product Details Size - 22"w X 22"h X 2"d (for duct opening measurement only)

6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] Custom Louvers Universal size 4 X 12 Is CRFG2028 Width_14in Universal size + Product Details Size – Duct end cap is 18" X 10" 26 gauge galvanized steel end cap