12" X 10" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 11.75"H] flat stamped steel Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 26 5/8" width X 8 5/8" height -

+ Product Details Size - 30"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 40"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 25 3/4" x 1"

12" X 10" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 11.75"H] flat stamped steel Actual Filter Size – 33+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 11. 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