10"w X 10"h [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 11.75"H] Curved Blade Steel + Product Details Size –

+ Product Details Size – 24"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 15 3/4"w x 25 3/4" x 1"

Actual Filter Size – 7 3/4"w x 5 3/4" x 1"

Actual Filter Size – 17 3/4"w x 23 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 24" OR 24" x 18" duct opening (measured at the opening)

10"w X 10"h [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 11.75"H] Curved Blade Steel + Product Details Size –+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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