Fiberglass Bifurcated Duct Axial Fan

Series 28B & 29B

Fiberglass Direct Drive Bifurcated Duct Axial® Fan is ideal for a variety of corrosive applications. It provides an excellent alternative to belt-drive fans, because the direct-drive motor requires minimal periodic maintenance. The units can be installed in any position, from vertical to horizontal. Standard sizes are 24 through 48″.

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.

Series 28B – Sizes 24” to 48” – 6-blade, Type FW, low pressure

Series 29B – Sizes 24” to 48” – 6-blade, Type E, medium pressure

All structural parts in the airstream are fiberglass and corrosion-resistant resin. All fiberglass surfaces are protected with a minimum 12 mil. thickness of a chemical-, flame- and ultraviolet-resistant resin with a Class I flame spread rate of 25 or less. Taped joints inside the casing are a minimum three layers of 2 oz. material. Internal hardware is austenitic stainless steel, encapsulated with a layer of fiberglass and resin.

Additional Series 29B features:

  • Corrosion-resistant FRP construction
  • Suitable for temperatures up to 200°F
  • One-piece fiberglass propellers with resin coating
  • Extended shaft, C-face, TEFC motors are standard
  • Motor body enclosed in aerodynamic tube and protected from the airstream
  • Neoprene shaft seal with sandwich-type design seals the motor shaft at the inner tube
  • Extended lubrication tubes and grease fittings are standard
  • Dynamically balanced at the factory prior to shipping
  • Supplied packaged, assembled and ready to install
  • Alternative resins, constructions, motors and accessories also available


Bifurcated Duct Axial® Fan | Hartzell Air Movement

Specifications & Resources


0-1.5" s.p.1.5-3" s.p.