I'm working on a project where the building owner is going to provide several Fan&Coil units, the fan control of these units has 4 different presets of velocity being: super high, high, medium, low. The velocity is controlled automatically and can be over written from the BMS.

Would it be correct to model the fan control as variable speed? since constant volume would not be correct and two speed wouldn't be as accurate as it could behave. Software being used is eQuest. Thanks in advanced!