Housing |
The fan windband shall be constructed of heavy gauge aluminum or G90 Galvanized and shall be spun on an automatic lathe to provide consistent dimensions. Horizontal and vertical internal supports shall be used to securely fasten the windband to the discharge apron to provide rigidity for hinging and added strength to reduce shipping damage. The discharge apron shall have a rolled bead for added strength. |
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Base |
The base shall be constructed of galvanized steel for improved rigidity. Base
corners shall be welded to provide strength and support for hinging and cleaning
and to prevent leakage into the building.
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Wheel |
The fan wheel shall be centrifugal backward inclined and non-overloading. The wheel blades shall be
aerodynamically designed to minimize turbulence, increase efficiency and reduce
noise. The wheel blades shall be welded to the wheel inlet cone. In the event
that balancing weights are required they shall be riveted to the blades or wheel.
The wheel inlet shall overlap the fan base inlet for maximum performance and
efficiency. The wheel shall be firmly attached to the motor shaft with two set
screws.
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Motor & Motor Compartment |
Motors shall be heavy duty ball bearing type, mounted out of the airstream and furnished
at the specified voltage, phase and enclosure. Motor mounting plate
shall be constructed of heavy gauge galvanized steel and isolated from the fan
structure with vibration isolators. The motor compartment shall be cooled by
outside air drawn through an extruded aluminum conduit tube. To seal the conduit
tube passage and prevent noise silicone rubber grommets shall isolate the conduit
tube from the fan housing. The motor compartment shall be of a two-piece construction
with the top cap having quick release clips to provide quick and easy access to
the motor compartment.
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Shaft & Bearings |
Shafts shall be precision ground and polished. Heavy duty, pre-lubricated
bearings shall be selected for a minimum (L10) life in excess of 200,000 hours of
operation at maximum cataloged operating speed. They shall be designed for and
individually tested specifically for use in air handling applications.
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Belts & Drives |
Belts shall be oil and heat resistant, non-static type. Drives shall be cast
type, precision machined and keyed and secured attached to the fan and motor
shafts. Drives shall be sized for a minimum of 150% of the installed motor
horsepower. Fan operating speed shall be factory set using adjustable pitch
motor pulleys.
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Grease Spout |
A grease spout made of aluminum tubing shall be welded to the fan housing.
The weld shall be factory tested to ensure it will not leak.
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Nylon Washers |
To provide a tight seal all fasteners in the fan housing shall be backed
with nylon washers.
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Safety Disconnect Switch |
A safety disconnect switch shall be standard on all units with
open drip proof motors. Switches shall be installed in a NEMA3R enclosure and
mounted to exterior of windband for easy access.
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Product: Fan shall be model as manufactured by
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