8" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 12"] RG66 Black-HP and then smoothly drop in

and then smoothly drop in the grill

+ Product Details Size – 24" x 24" with 12" collar T-Bar drop ceiling perforated return grill - metal back casing

+ Product Details Size – 16"w X 26"h is the size for the duct opening measurement only

Total outer size of this grille is

8" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 12"] RG66 Black-HP and then smoothly drop in+ 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