A Warning message in AFT Arrow

Centrifugal compressor/fan curves typically have a point at which they no longer operate on the curve. This may be called "end of curve" or "runout". Data defining runout for a particular compressor/fan is given by the manufacturer. Such data has been defined for this compressor/fan in the configuration window, and the system is operating past the runout flow rate. Thus the results are invalid, because the compressor/fan cannot actually operate at that point.