10"w X 10"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 11.75"H] 18in diameter + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

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

875" width X 25

Elevate your air system today and enjoy improved aesthetics and efficient airflow for a comfortable living environment

Optional Butterfly Damper Available At Asin: B007CNEL1W

+ Product Details Size – 14"w X 30"h is the size for the duct opening measurement only

10"w X 10"h [Duct Opening] 3 Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 11.75"H] 18in diameter + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 28"w X 28"h is the size for the duct opening measurement only 875" width X 25