12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [White] - [Total Outer Dimensions: 16"] 18" Diameter 75"H – fits a 20"

75"H – fits a 20" X 12" duct opening

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

Design – Rigid gauge built for durability and long life in mind

75"H – fits a 14" X 8" duct opening

12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [White] - [Total Outer Dimensions: 16"] 18" Diameter 75"H – fits a 20"+ Product Details Size The listed 12" diameter refers specifically to the size of the duct opening. However, please note that the total outer dimensions of the grille measure 16" 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