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" Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 19 3/4" x 1"

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

actual front end outer dimensions are approximately 30 5/8" width X 18 5/8" height

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" Actual Filter Size – 27+ 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