8" X 4" [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 5.75"H] Compatible with Duct 6" even without needing to remove

even without needing to remove the thermostat

Rigid gauge built for durability and long life in mind

actual front end outer dimensions are approximately 32 5/8" width X 14 5/8" height

Actual Filter Size – 19 3/4"w x 11 3/4" x 1"

Design – Removable face for cleaning and access to damper - wooden damper for airflow shutoff control

8" X 4" [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 5.75"H] Compatible with Duct 6" even without needing to remove+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 5. 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