Propeller Upblast Fans (Models RBU, RBUMO and RDU)
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Propeller Upblast Roof Fans Models RBU, RBUMO and RDU Direct Drive and Belt Drive

Propeller Upblast Roof Fans of Fans Contents Model Comparison . . . . . . . . . . . . . . . . 3-4 Basics of Fan Selection . . . . . . . . . . . . . . . 5 Construction Features/Details . . . . . . . . . . . 6-7 Service . . . . . . . . . . . . . . . . . . . . . . . . 8 RBUMO - Belt Drive - Motor out of airstream . .12 Sizes 20-60 Capacities to 62,000 cfm and 1.0 in. wg RDU - Direct Drive Fans . . . . . . . . . . . . .13 Sizes 18-48 Capacities to 43,000 cfm and 1.0 in. wg Selection Guide . . . . . . . . . . . . . . . . . . .14 Accessories . . . . . . . . . . . . . . . . . . . . 8-9 Model...

Propeller Upblast Roof Fans [^greenheck Building Value in Air. Greenheck upblast propeller fans are designed to discharge contaminants up and away from the building for most commercial jobs and many industrial applications. These roof exhaust fans are available in both belt and direct drives with steel or aluminum blades. Drive frames and panels are constructed to match the level of duty and motor size. • Wide range of construction and performance capabilities provide for the most complete upblast propeller fan line available. • Regardless of fan size, performance or duty level, all upblast...

Model Comparison Construction Levels Direct Drive Fan Selection These models are designed and constructed for applications with static pressure ranges up to 1 in. wg. Propellers are cast aluminum. For low sound applications, it is best to select the largest fan with the lowest RPM to meet the performance requirements. This ensures the tip speeds will be as low as possible. Belt Drive Fan Selection Propeller Types Application requirements for sound and static pressure determine propeller type. Propellers are available in fabricated steel, fabricated aluminum or cast aluminum. Belt Drive...

The first consideration in any fan selection is the amount of air to be moved and the resistance to this air movement. With specific performance and application criteria in mind, propeller fan selections typically require decisions based on the following criteria. Belt Drive vs. Direct Drive Belt drive fans offer the ability to adjust fan speed for system balancing if necessary. They also offer more flexibility in speeds and motor selections. In a cost comparison, belt drive fans are typically less costly than comparable size direct drive fans with low speed motors. Direct drive fans are...

Construction Features s Models RBU, RBUMO and RDU U Windband is heavy–gauge galvanized (or painted) steel construction with bolted seams. Edges are reinforced for added strength and have built–in damper stops. Drive Frames are die-formed, galvanized structural steel to provide a rigid platform for motors, shafts, bearings and drives. Adjustable Motor Plate for belt tensioning. Drive Assembly belts, pulleys and keys are sized for 150% of driven horsepower. Curb Caps are constructed of galvanized steel in sizes 18-48. Sizes 54 and 60 are constructed of painted steel. Curb caps include an...

[Sgreenheck Building Value in Air. Construction DetailsModels RBU, RBUMO and RDU *Approximate weight does not include accessories. *Dimensions in inches (millimeters) and weight. ibs (kg). *Approximate weight does not include accessories. *Dimensions in inches (millimeters) and weight. lbs (kg).

[Sgreenheck Building Value in Air. RBUMO (pictured) NOTE: To service RBU and RDU fans, it is recommended the fan be accessed from below (looking up). If this is not possible, the fan may be serviced by taking off the removable windband. Removable Windband The windband can be lifted off by removing the bolts from the four windband mounting brackets. When the windband is removed, access to the fan can be made through the butterfly dampers. For specific details on this procedure, please refer to the Installation Operation and Maintance Manual for this model found on greenheck.com Motor out of...

Aluminum Propellers Available for spark resistance. Extended Lube Lines For belt driven fans—lubrication lines with grease fittings that extend from the shaft bearings to the exterior of the fan base. Extended lube lines allow for bearing lubrication from the rooftop without disassembling the fan. Inlet Guards Model RBUMO fans are available with protective guards for mounting to the fan inlet. For models RBU and RDU, protective guards are available when mounted within a base extension. NOTE: When an inlet guard is not ordered with the fan, it should be provided by the installer. Motorized...

High Temperature Option 500°F (260°C) for a minimum of 4 hours 1000°F (538°C) for a minimum of 15 minutes This construction meets specifications for IRI requirements of 500°F (260°C) air for a minimum of 4 hours and the SBCCI “Standard Fire Prevention Code” requirements of 1000°F (538°C) for a minimum of 15 minutes in emergency smoke removal applications. In addition, this construction exceeds British Standards 7346 Class B (250°C for 2 hours), Class C (300°C for 30 minutes) and Class D (300°C for 1 hour) temperature requirements. Temperature ratings are tested in accordance to UL...

Wiring from the motor to the disconnect box is provided when a fan is ordered with a mounted disconnect. Toggle type and heavy–duty disconnect switches are available for positive electrical shut-off and safety when servicing fans. The following switches are available to meet individual electrical requirements and can be factory mounted or shipped loose for field mounting. UL/cUL 705 All model RBU and selected model RDU fans with totally enclosed motors are available with the UL/cUL 705 Listing for electrical. The UL/cUL 705 Listing is available on Model RBUMO fans with open and totally...

[Sgreenheck Building Value in Air. Dimensional Data Level 1,2 and 3 Models RBU and RBUMO Model RBU - Belt Drive All dimensions are in inches (millimeters). *Dimension may vary depending on motor. All dimensions shown in inches (millimeters). +Sizes greater than 36 with high temperature option will be 5 inches larger. *Dimension may vary depending on motor.