Fiberglass Duct Fans

Series 28, 34 & 35

Hartzell’s Fiberglass Duct Fans are engineered to be installed in duct systems for process ventilation applications in corrosive environments. The Fiberglass Belt Drive Duct Fan is engineered for applications where the nature of the corrosive airstream warrants isolation of the motor and drive assembly from the airstream.  They are best-suited for applications with low static pressure characteristics from free air to 1″ static pressure.

Standard fiberglass components are made of solid molded fiberglass consisting of corrosion resistant vinyl ester resin and glass fibers. All nuts, bolts and fasteners in contact with the airstream are stainless steel and encapsulated with fiberglass. Resin has a Class I flame spread rate of 25 or less. External fiberglass housing surfaces are protected with a minimum 10-mil UV resistant resin coating.

Solid one-piece molded fiberglass construction, electronically balanced on the unit at the operating speed to ensure vibration free operation. – Sizes 12” to 60” with adjustable blade options for sizes 54” & 60”

Direct Drive: Mill/Chem duty motor is standard. Other motors are available upon request.  AMCA Certified — Sound & Air performance.

Belt Drive: Motors are exterior mounted, out of the airstream. The propeller shaft rotates in two heavy-duty bearings mounted on fiberglass supports taped to the inner shell. Totally enclosed fan cooled motors are standard. Special motors are available upon request.

V-Belt drives over-sized for long life and continuous duty. Variable pitch drives are standard on units up to and including 10 HP. Variable pitch drives can be furnished on higher horse-power units upon request. Belts are oil, heat and static-resistant type.

Additional \features:

  • Corrosion-duty construction
  • Heavy industrial-duty construction
  • Suitable for temperatures up to 200°F
  • Solid-fiberglass airfoil propeller
  • Oversized oil-, heat- and static-resistant belts for continuous duty
  • Solid-fiberglass fan housing
  • Dynamically balanced at the factory prior to shipping
  • Supplied packaged, assembled and ready to install
  • Alternative resins, constructions, motors and accessories also available
Fiberglass Duct Fans| Hartzell Air Movement

Specifications & Resources


0-1.5" s.p.