The new Orix fans from Oriental Motor can be set up to provide an alarm
signal in the event that the fan speed falls below a certain level or
stops altogether. These axial flow units are available in a number of
frame sizes, providing air flows from 0.18 to 2.7m3/min (fan stopped
alarm version) and 2.7 to 24m3/min (fan slowed alarm version). These fans
are suitable for cooling devices enclosed in cabinets, which heat up
quickly. The alarm output can be used to trigger local audible or visible
indication of a problem, or it can be fed to a plant or building
monitoring system for remote alarm indication.