14" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 5.75"H] w16h16 + Product Details Size –

+ Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 36 5/8" width X 28 5/8" height

providing a perfect fit for most standard thermostats

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 18" duct openings

14" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 5.75"H] w16h16 + Product Details Size –+ Product Details Size 14"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 15. 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