12" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] Color_R-8.0 Pink Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

actual front end outer dimensions are approximately 14 5/8" width X 8 5/8" height

Filter Size - 20

engineered for seamless 360-degree airflow in T-bar ceilings

+ Product Details Size - 12"w X 18"h is the size for the duct opening measurement only

12" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] Color_R-8.0 Pink Actual Filter Size – 13+ Product Details Size 12"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 5. 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