12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [White] - [Total Outer Dimensions: 16"] Color_R-8.0 Pink Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 17 3/4" x 1"

Key Features:

+ Product Details Size - 36"w X 12"h is the size for the duct opening measurement only

Think of the diameter as a straight line from one end to the other

12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [White] - [Total Outer Dimensions: 16"] Color_R-8.0 Pink Actual Filter Size – 24+ 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