14" X 12" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 13.75"H] return filter Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

actual front end outer dimensions are approximately 28 5/8" width X 24 5/8" height

Universal Fit – Measures 6-1/4" wide x 4-3/4" high x 3" deep

+ Product Details Size - 30"w X 20"h is the size for the duct opening measurement only

The operable dampers

14" X 12" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 13.75"H] return filter Actual Filter Size – 23+ Product Details Size 14"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 13. 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