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Impeller type


Square Inline Centrifugal Fan,
Belt Driven


The BSI Square Inline Centrifugal Fan is specifically designed for duct applications handling relatively clean air, including supply, exhaust and return air systems. The BSI 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 BSI 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 40.25 inches (205 mm to 1,025 mm)


  • Airflow to 27,400 CFM (46,600 m3/hour)
  • Static pressure to 3.5 inches w.g. (870 Pa)

Product Catalog

Installation manual