Class 5000 fans are specifically designed for heat exchanger
and cooling tower service and other efficiency-critical
applications. They may be specified as original equipment or for
replacement of existing obsolete or inefficient fans. Class 5000
fans are available in eight hub sizes (series) in fan diameters
from 3 ft (914 mm) to 24 ft (7315 mm) of all aluminum
construction. See Specifications
for details. Class 5000 fans have also been ruggedized for engine
drive applications.
Blades are balanced to a standard moment making them freely interchangeable between fans of the same series and diameter, even between manual or automatic units. Back to top
Because blades are individually balanced, the exact number may be selected to provide the correct blade surface for the required performance, avoiding the inefficiency and additional cost of excess blades. Back to top
Minimizing the clearance between the tips of the blades and the fan ring is essential if a fan is to operate efficiently and satisfy the performance requirements of the installation. Most Moore hubs provide a means of increasing or decreasing the fan diameter by as much as 1-1/2" (38 mm) — an important feature in "fitting" the fan precisely to an existing ring. Back to top
IDEAL FOR VARIABLE SPEED DRIVES
Varying fan speed is the most efficient means of modifying air flow. Because of the dynamics of the resilient blade mounting, fan resonance are virtually eliminated, ideally suiting Moore fans for use with variable speed drives. There are no critical speeds to be avoided. Back to top
Like the blades of a helicopter, Moore
fan blades are attached to the hub by a pivot. In operation,
centrifugal force causes the blades to rise to their working
position. The pivot itself is surrounded by a vibration-absorbing
resilient material. Two of the major advantages of this design
are:
1. Compared to fans with rigidly mounted blades, only 1/4 to 1/2 of the stresses caused by the air load are transmitted to the hub and drive, substantially increasing the life of the fan driving mechanism.
2. Resonant frequencies are virtually eliminated. Back to top
LOW WEIGHT - LOW COST - LOW INERTIA
The stressed-skin construction of the jig-formed aluminum blade produces a very rigid, yet light weight member. Light weight reduces material costs and installation costs. One man can easily carry two Moore blades. The all-aluminum hub is more easily installed than steel hubs.
Low weight also results in lower inertia, reducing the possibility of damage to the fan and drive during sudden stops. Back to top
Hubs with either manual or automatic blade adjustment are standard (except Series 19 and 27) complete with QD bushings. Remote actuators are also available.
Upon air failure, blades can revert to either last position, maximum pitch or minimum pitch. Back to top
As part of The Moore Company's ongoing noise research, fans can be provided which substantially reduce fan noise levels. Blade-end winglets (patent pending) may be provided to reduce the fan noise level by as much as 3 dB. Back to top
UNIFORM VELOCITY FROM HUB TO TIP
Uniform velocity over the entire blade
area is the most important criteria of efficient axial flow fan
design. To produce a uniform velocity throughout its length, a
fan blade must vary from a thin, narrow tip to a thick, cambered
root. Each point on the blade must have the proper combination of
chord (blade width) and angle. This results in a great deal of
twist in a properly designed blade, a shape impossible to produce
by extrusion. Moore fan blades are jig-formed to provide the
complex contour needed for high aerodynamic efficiency. Back to top
NOTE :Owner's manuals for Moore fans are available online but require Adobe Acrobat Reader®. Acrobat Reader 5.0 or newer is recommended!If you do not have Acrobat Reader® on your computer, you can download it here: Acrobat Down load
