10"w X 4"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Material_Aluminum + Product Details Size -

+ Product Details Size - 8"w X 28"h is the size for the duct opening measurement only

Control Your Airflow on drop ceiling grilles

these airflow control components provide you with effortless control over your indoor environment

For 10" Round Duct Opening - Spiral or Flex

+ Product Details Size - 36"w X 26"h X 2"d (for duct opening measurement only)

10"w X 4"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Material_Aluminum + Product Details Size -+ Product Details Size 10"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 5. 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