12"w X 12"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] Compatible With Duct 8in + Product Details Size –

+ Product Details Size – 30"w X 6"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 13 3/4" x 1"

actual front end outer dimensions are approximately 26 5/8" width X 34 5/8" height

Actual Filter Size – 31 3/4"w x 11 3/4" x 1"

12"w X 12"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] Compatible With Duct 8in + Product Details Size –+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 13. 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