12"w X 12"h [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] w8h8 and with a built-in back

and with a built-in back 1/2" mesh they also protect you from annoying rodents like mice

+ Product Details Size - 24"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 10 5/8" height

+ Product Details Size - 12"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 28 5/8" height

12"w X 12"h [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] w8h8 and with a built-in back+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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