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 – 20"w X 24"h is the size for the duct opening measurement only

High Quality – High quality ABS plastic will never rust

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

+ Product Details Size - 22"w X 28"h is the size for the duct opening measurement only

providing a perfect fit for most standard thermostats

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