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GENERAL FAN PERFORMANCE NOTES
1.
Interpolation is permissible. Do not extrapolate.
2.
External static pressure is the static pressure difference
between the return duct and the supply duct plus the static
pressure caused by any FIOPs or accessories.
3.
Tabular data accounts for pressure loss due to clean filters,
unit casing, high gas heat (on gas heat models) and wet coils.
4.
Factory options and accessories may effect static pressure
losses. Selection software is available, through your sales-
person, to help you select the best motor/drive combina-
tion for your application.
APPENDIX C — FAN PERFORMANCE
63
5.
The Fan Performance tables offer motor/drive recommenda-
tions. In cases when two motor/drive combinations would
work, the lower horsepower option is recommended.
6.
The EPACT (Energy Policy Act of 1992) regulates energy
requirements for specific types of indoor fan motors.
Motors regulated by EPACT include any general purpose,
T-frame (three-digit, 143 and larger), single-speed, foot
mounted, polyphase, squirrel cage induction motors of
NEMA (National Electrical Manufacturers Association)
design A and B, manufactured for use in the United States.
Ranging from 1 to 200 Hp, these continuous-duty motors
operate on 230 and 460 volt, 60 Hz power. If a motor does
not fit into these specifications, the motor does not have to
be replaced by an EPACT compliant energy-efficient
motor. Variable-speed motors are exempt from EPACT
compliance requirements.
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