16" X 16" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 17.75"H] Color_Red Oak Wood Equipped with a locking eight-tumbler

Equipped with a locking eight-tumbler key system

Mounted with frame and bayonet joint which are included

Actual Filter Size – 9 3/4"w x 35 3/4" x 1"

+ Product Details Size – 20"w X 18"h is the size for the duct opening measurement only

16" X 16" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 17.75"H] Color_Red Oak Wood Equipped with a locking eight-tumbler+ Product Details Size 16"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 17. 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