18" X 6" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 19.75"W X 7.75"H] Compatible with Duct 10" margin-right: 12px

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Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 20" duct openings

Actual Filter Size – 35 3/4"w x 21 3/4" x 1"

Design – Circular return valves - designed to be used in low and medium pressure ventilation air conditioning systems

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18" X 6" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 19.75"W X 7.75"H] Compatible with Duct 10" margin-right: 12px+ Product Details Size 18"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 7. 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