10" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 14"] w16h16 + Product Details Size -

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

Its linear bar design maximizes ventilation

When it's time to upgrade your HVAC Vents in your house

Actual Filter Size – 17 3/4"w x 21 3/4" x 1"

+ Product Details Size - 12"w X 14"h is the size for the duct opening measurement only

10" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 14"] w16h16 + Product Details Size -+ Product Details Size The listed 10" diameter refers specifically to the size of the duct opening. However, please note that the total outer dimensions of the grille measure 14" 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