Direct drive fans are centrifugal power roof ventilators designed for exhausting clean air. Capacities up to 2770 CFM and up to 1 inch static pressure.

The PRN is a downblast exhauster suitable for all types of commercial and institutional buildings such as schools, hospitals, office buildings, and retail stores.

Construction Features


  • Hoods constructed of heavy gauge aluminum, die formed with rolled bead for strength
  • Curb base and inlet are one piece with continuous welded corners
  • Steel fasteners are zinc dichromate plated
  • Heavy gauge galvanized wire birdscreen
  • Heavy gauge corner support brackets transmit motor and impeller weight to curb base
  • Conduit post for ease of electrical wiring

Airfoil Centrifugal Wheel

  • Aluminum construction with backward curved hollow airfoil blades
  • Non-overloading design for safe operation
  • Precision balanced for smooth vibration free operation


  • Continuous duty motors located outside the airstream
  • Motor compartment is ventilated by a “forced air” cooling system
  • Factory wired with polarized disconnect plug (except explosion resistant motors)


  • Roof Curbs
  • Dampers
  • Solid State Speed Controllers
  • Coatings
  • Disconnect Switch
  • Aluminum Birdscreen

Additional Info

  • Max Static Pressure: 1.0" w.c.
  • Max Airflow (CFM): 2770
  • Drive Type: Direct Drive
  • Blade Type: Centrifugal

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