8" X 6" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 7.75"H] w30h30 + Product Details Size -

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 9 3/4" x 1"

Operating temperature from -40°f to +248°f [-40°c to +120°c]

actual front end outer dimensions are 16" width X 8" height

8" X 6" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 7.75"H] w30h30 + Product Details Size -+ Product Details Size 8"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 7. 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 Location