12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 16"] 8" Diameter Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 29 3/4" x 1"

our grill boasts an impressive 96% airflow capacity

Filter Size - 9

+ Product Details Size - 6"w X 28"h is the size for the duct opening measurement only

40"w X 16"h Is The Size For The Duct Opening Measurement Only

12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 16"] 8" Diameter Actual Filter Size – 33+ 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