18" X 12" 3-Way AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face 18in diameter /* Adding space between bullet

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+ Product Details Size – 30"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 12"h is the size for the duct opening measurement only

this 4-way air vent diffuser allows you to precisely control airflow

18" X 12" 3-Way AIR SUPPLY GRILLE - DUCT COVER & DIFFUSER - Flat Stamped Face 18in diameter /* Adding space between bullet+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 13. 75" height. High Quality High grade steel construction with easy unrestricted air flow for your HVAC system. Installation Location Sidewall & ceiling. Design Multi shutter damper with handle lever for easy opening and closing screws included. Powder Coat Finish Smooth, shiny, scratch resistant,