arduinoTime:
Sorry, sir zoomkat, but how can you use paddle switches in fan status detection? Could you give us a drawing? I kept on imagining putting the switch inside the fan and blades getting stuck in the switch.
They are called air flow switches. The fan creates a positive air flow which blows against the paddle target of the micro-switch. If switch drops out then it's because there is no air flow. Much better then just monitoring fan motor current as a plugged fan inlet will result is over heating of the equipment even though the fan motor is spinning fine.