The scope of this standard includes all electric motor-driven fan systems that use a specific combination of components defined below:

  1. Fan airflow performance
  2. Polyphase induction motors
  3. Pulse-width modulated variable frequency drives (VFDs)
  4. Mechanical power transmissions that use V-belts, synchronous belts, or flexible couplings.


Steve Lawrence on 2019-09-05 19:18:00

Section/Figure/Table No.: Section

Type of Comment: General

Comment (justification):
Halfway down the page, the sentence below the Nm equation, NB is referred to as the nominal motor efficiency, when it should be NR.

Proposed Change:
Revise NB to NR.

Steve Lawrence on 2019-09-05 13:00:00

Section/Figure/Table No.: Annex E.2

Type of Comment: General

Comment (justification):
In the final equation for calculating Wc, the percentage used in the equation for Nmc is the Lc percentage.

Proposed Change:
The percentage should be 0.856, not 0.888.

Armin Hauer on 2019-01-31 15:30:00

TEFC 8-pole column is incorrect. It's using the minimum column from NMEA MG1 by mistake

Armin Hauer on 2019-01-31 11:47:00

EPCA affected motors in 1975; now it's EISA (EISA is mentioned correctly in another 4 places)

Armin Hauer on 2018-12-03 16:30:00

typo eta R instead of eta B

Armin Hauer on 2018-12-03 11:46:09


Armin Hauer on 2018-12-03 11:45:43

missing word

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