Inline Centrifugal

Impeller Type


Square Inline Centrifugal Fan,
Direct Drive


The SCDD square inline centrifugal fan is specifically designed for duct applications handling relatively clean air, including supply, exhaust and return air systems. The SCDD fan offers high efficiency and quiet operation in a compact design that can be mounted in any position (horizontal, vertical or angular). Duct collars are provided for easy mounting without the need for square to round duct transitions.

The SCDD utilizes a non-overloading, backward inclined centrifugal impeller precisely matched to a spun venturi. All impellers are statically and dynamically balanced.

Sizes (impeller diameters)

  • 8 to 16.5 inches (205 mm to 420 mm)


  • Airflow to 5,800 CFM (9,900 m3/hour)
  • Static pressure to 2 inches w.g. (500 Pa)