12" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 14"] rg1010 Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 12" duct openings

Actual Filter Size – 19 3/4"w x 29 3/4" x 1"

and 4-way configurations

Installation Location – Wall or door mount - door thickness up to 32mm - anodised finish - smooth & beautiful

+ Product Details Size – 8" round duct opening

12" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 14"] rg1010 Ideal for Walls & Ceilings:12" Diameter Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 12" Diameter Incorporated with Integral Butterfly Damper for full Airflow Control Assembeled Before Powder Coat Paint, to Ensure Perfect Smooth Finish Commercial Grade Aluminum Will Never Rust Designed for Warehouses, Factories, Workshops, Gymnasiums & Restaurants Center Core is Removable for Easy Access and Maintence 12" Circular Round Aluminum HVAC