8" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] Insulated Line actual front end outer dimensions

actual front end outer dimensions are approximately 27 5/8" width X 22 5/8" height

+ Product Details Size – 34"w X 30"h is the size for the duct opening measurement only

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

75"H – fits a 24" X 8" duct opening

75"H – fits a 20" X 20" duct opening

8" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] Insulated Line actual front end outer dimensions+ 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