12" X 10" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 11.75"H] 18" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 36 5/8" width X 26 5/8" height

Choose from a palette of four elegant colors – white

if your hole is 20" wide by 14" tall

Actual Filter Size – 31 3/4"w x 27 3/4" x 1"

12" X 10" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 11.75"H] 18" Round Duct Pipe actual front end outer dimensions+ 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