8" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [White] - [Total Outer Dimensions: 12"] with filter + Product Details Size -

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 30 5/8" height

High diffusion induction rates result in rapid temperature and velocity equalization of the mixed air mass well above the zone of occupancy

+ Product Details Size - 6"w X 6"h X 2"d (for duct opening measurement only)

thanks to counter-sunk screw holes and included screws

8" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [White] - [Total Outer Dimensions: 12"] with filter + Product Details Size -+ Product Details Size The listed 8" diameter refers specifically to the size of the duct opening. However, please note that the total outer dimensions of the grille measure 12" in diameter. Design Heavier gauge than needed, built for durability and long life in mind, but still light and handy. (Screws included). Airflow Easy unrestricted airflow for your HVAC system. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was