Series 89 Aluminum Adjustable Pitch Fans deliver high-efficiency airflow at moderate pressure. Performance is stable at a wide range of flow volumes with medium to high blade angle settings, capable of up to 75% efficiency (average efficiency for this design is 65%). Efficient operation ranges from free air through ¾" w.g. All sizes are available as four- or six-bladed designs.
Two fan types are available: Model A and Model AS.
Model A fans are available in diameters from 48 to 144", with air volume of 13,000 to 435,000 CFM at free air. The hub is cast aluminum with a self-contained blade housing threaded to accept the blades. The blades have threaded shanks, which screw into threaded aluminum hub sockets. It’s easy to change the angle by loosening the hub clamping bolts at each blade socket and rotating the blade. Model A fans are suitable for temperatures up to 200°F.
Model AS fans are available in diameters from 156 to 168", with performance to 450,000 CFM at 0.7" S.P. The hub is constructed of heavy-welded steel with a drop-in blade assembly and bolted steel cap blade retention. Blade angle changes are made by loosening the steel cap just enough to rotate each blade to the required angle. Model AS fans are suitable for temperatures up to 300°F.
Sizes 48 through 72" are furnished with clamp-type bushing as standard. Sizes 84" and larger are furnished with split taper bushing as standard. Clamp-type bushings are also available on sizes 84 through 144".
All sizes are available in right-hand (clockwise) rotation. Left-hand (counterclockwise) rotation available in sizes 72, 84, 96, 108, 120 and 132" only.
Fans are tested for sound and air ratings in Hartzell’s AMCA Accredited Laboratory in accordance with industry standards.
Additional Series 89 features:
- Sand-cast, aluminum airfoil blades, ground to satin finish for balance
- Maximum tip speed of 15,000 FPM
- Hubs dynamically balanced at the factory prior to shipping
- Blades statically balanced against a master blade
- Supplied knocked down standard; shipment of complete assemblies up to 72" available on request
- Special coatings and constructions available, including coatings for corrosive applications