Adjustable/Fixed Pitch Duct

Duct fans are best suited for applications with low pressure characteristics from free air to 2” static pressure. These versatile and dependable fans can be used to remove fumes, dirt-laden air, steam, hot air, and smoke; or to supply air for cooling, drying, and general ventilation; or in air makeup applications. They are well suited for air moving applications requiring high flow and low to medium pressure where adjustable pitch blades allow fans to be accurately set. Some high speed duct fans can deliver up to 6” static pressure, but at higher sound levels. Low speed ultra quiet selections are available for installations where low sound levels must be maintained. Lower speed operation can reduce sound levels by 5-10 dBA.

Series 31 Belt Drive Duct Fans are ideal for applications where it is advantageous to have the motor outside the airstream, including fumes, hot or moist air, or dirt-laden conditions. Protective coatings are also available as an option if corrosive air is present. Standard sizes are 12 through 96″.  AMCA-certified for air performance, the Series 31 drive components (belts, sheave, shaft and bearings) are enclosed in an inner drum and protected from the airstream. This casing is positioned on the negative air pressure side of the propeller, drawing outside air over the bearings. Access to the shaft and bearings is through a removable bearing cover. The propeller shaft rotates in two ball bearings mounted on steel supports welded to the inner shell of the housing.

The Series 31U Belt Drive Utility Duct Fan is best-suited for applications with low-pressure requirements from free air to 1¼ inches of static pressure. These versatile and dependable fans can be used to remove fumes and hot air, or for cooling, drying and general ventilation. They can also be used for paint spray exhaust systems. Standard sizes are 12 through 60″.

The Hartzell Series 38 Direct Drive Duct Fan is designed to handle relatively clean and corrosive-free air at temperatures up to 104°F. Standard sizes are 12 through 48″. Fans are designed for mounting in any position from horizontal to vertical. AMCA-certified for air performance.

The Series 39 Adjustable Pitch Duct Fan, Direct Drive, is best suited for applications requiring high flow and low to medium pressure, at temperatures not exceeding the motor rating, where adjustable pitch blades allow fans to be accurately set. Propellers are high efficiency and quiet. Low-speed, ultra-quiet selections can reduce sound levels by 5–10 dBA.  Standard sizes are 16 through 48″. Fans are designed for mounting in any position from horizontal to vertical.

The Series 39V Direct Drive Adjustable Pitch Duct Fan With Vane Section is best suited for applications requiring high flow and low to medium pressure at temperatures not exceeding the motor rating where adjustable pitch blades allow fans to be accurately set. Propellers are high efficiency and quiet. Low-speed, ultra-quiet selections can reduce sound levels by 5–10 dBA. The addition of a specially designed vane section to the Series 39 increases performance and lowers the sound level in some fan systems. It is also beneficial in systems with elbow or reducer cones on the fan discharge, as it minimizes the swirl on the fan discharge.  Standard sizes are 16 through 48″. Fans are designed for mounting in any position from horizontal to vertical.

Series 52 Tubeaxial Blowers are designed for systems requiring high volumes of air with static pressures to 6″. These fans fill a gap in performance between standard duct fans and duct axial fans. They are available in sizes 12 to 24″, with performance from 1,501 to 11,878 CFM at free air. Because of high RPM, these fans are not recommended where noise is a factor.  Rigid motor mounts provide support for foot-mounted motors. Designed for minimum resistance to airflow.

Additional Series 52 features:

• Rigid motor mounts
• Extended lubrication tubes from bearings to exterior of fan housing are standard
• Industrial-grade, powder coat, enamel coating standard
• Dynamically balanced at the factory prior to shipping
• Supplied packaged, assembled and ready to install
• Special coatings, constructions, motors and accessories also available