For each fan, the fan brake horsepower shall be indicated on the construction documents and the selected motor shall be not larger than the first available motor size greater than the following:
- For fans less than 6 bhp (4413 W), 1.5 times the fan brake horsepower.
- For fans 6 bhp (4413 W) and larger, 1.3 times the fan brake horsepower.
- Systems complying with Section C403.8.1 fan system motor nameplate hp (Option 1).
Exception: Fans with motor nameplate horsepower less than 1 hp (746 W) are exempt from this section.