14"w X 6"h [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 7.75"H] Round Damper Ring + Product Details Size -

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

and sound level range of NC 25 to 35

Measuring 5" in diameter for the duct opening

+ Product Details Size - 6"w X 34"h X 2"d (for duct opening measurement only)

But they are also the most visible representation of you air system

14"w X 6"h [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 7.75"H] Round Damper Ring + Product Details Size -+ Product Details Size 14"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 7. 75" height. High Quality High quality steel with counter sunk screw holes (screws included) and no sharp edges. Equipped with a lever for easy airflow adjustment and dampening. Airflow Control Adjustable airflow lever allows precise control over the direction and volume of air. Installation