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| TYPICAL SPECIFICATIONS |
| Model: |
NSAU |
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| Description: |
Fan shall be G90 galvanized steel, roof mounted, belt drive or
direct drive, forward curved, filtered supply fan.
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| Certifications: |
Fan shall be listed by ETL and conforms to UL705 and CSA Std. C22.2, No. 113 standards. |
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| Construction: |
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| Housing |
| The fan shall be constructed of heavy gauge G90 galvanized steel for maximum
corrosion resistance. Lid is removable for easy access to interior components
for service. Intake hood shall be designed with a large intake area to assure
low pressure drop and maximum weather resistance. Weather hood shall include 2"
washable filters.
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| Base |
| The base shall be constructed of galvanized steel for improved rigidity. Base
shall be structurally reinforced to accommodate the blower assembly.
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| Blower |
| The blower wheel shall be forward curved centrifugal, constructed G-90 galvanized steel.
Wheels shall be balanced
in two planes and done in accordance with AMCA standard 204-96, Balance Quality and
Vibration Levels for Fans. The wheel blades shall be aerodynamically designed to
minimize turbulence, increase efficiency and reduce noise. The wheel blades shall be
securely attached to the wheel inlet ring. The wheel shall be firmly attached to the
fan shaft with set screws and keys. The blower assembly shall be isolated from the fan
structure with vibration isolators.
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| Motor & Motor Compartment |
| Motors shall be heavy duty ball bearing type and furnished at the specified
voltage, phase and enclosure. Motor mounting plate shall be constructed of
heavy gauge galvanized steel and shall be designed to provide easy adjustment
of belt tension (belt drive units only).
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| Shaft & Bearings (Belt Drive Units Only) |
| Shafts shall be precision ground and polished. Heavy duty, pre-lubricated
bearings shall be selected for a minimum (L50) 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 (Belt Drive Units Only) |
| 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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| Product: Fan shall be model NSAU as manufactured by
CaptiveAire Systems.
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