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 /* Adding space between bullet

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Actual Filter Size – 24 3/4"w x 19 3/4" x 1"

Upgrade your air distribution strategy today – invest in the efficiency and convenience of the 8" Radial Damper

+ Product Details Size - 18"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 30 5/8" height

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 /* Adding space between bullet+ 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