8" x 8" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w28h28 actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 20 5/8" height

actual front end outer dimensions are approximately 34 5/8" width X 27 5/8" height -

These are airflow control components made to connect to supply grilles of the drop ceiling

+ Product Details Size - 16"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 6"h is the size for the duct opening measurement only

8" x 8" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover w28h28 actual front end outer dimensions+ Product Details Size 8" X 8" is the size for the duct opening measurement only, actual front end outer dimensions are 3". Design Equipped with lever for full airflow control; back blades made of black plastic for reduced air noise and discreet appearance; "Opposing" back blades, ensuring they don't overlap, provide precise damper control and superior air dispersion. High Quality Aluminum The premium durable aluminum will never rust and it will never