12" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] Supply Grille Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 8" X 6" duct openings

Actual Filter Size – 11 3/4"w x 7 3/4" x 1"

+ Product Details Size - 25"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 14"w X 32"h is the size for the duct opening measurement only

12" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] Supply Grille Ideal for Walls & Ceilings:+ Product Details Size 12"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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