14" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 5.75"H] white + Product Details Size -

+ Product Details Size - 36"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Size - 4"w X 36"h is the size for the duct opening measurement only

also referred to as T-Bar or Lay-in system

and squirrels

+ Product Details Size - 36"w X 18"h is the size for the duct opening measurement only

14" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 5.75"H] white + Product Details Size -+ Product Details Size 14"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 15. 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