Thanx guys,.. I was thinking about perhaps an air flow switch drilled/tapped into the PVC pipe that would go to a relay, so if the fan decides to quit, the air flow leaf/reed switch opens and trips the relay, thus sending a signal to a strobe or alarm device.
Hey Trumpy, how's it going man? I hope all is well... I missed this place, glad to be back!!
Greg, thanx for the advice man, I've never encountered a dilemma such as this.. I love a good challenge...
