Patent ID: 6098023
Filing Date: 2000-08-01
Classification: F24F,G05B,G06F,H01H

Abstract:
A fan filter unit having a fan, a driving motor, a filter, and a monitoring device comprising:a switching section positioned relative to said fan so as to be responsive to a force from an air stream introduced therein via rotation of said fan, said switching section including at least one terminal, and a switch body movable by said force from a first position to a second position, said switch body being in operative electrical contact with a respective said terminal when in one of said positions thereof, and out of operative electrical contact with said respective terminal when in the other position thereof, and said switch body providing a path for electric current to said respective terminal when in operative electric contact therewith; anda display section including an electrically operated display connected to said at least one terminal, said display providing a signal, indicative of an operating state of said fan, when supplied with electrical power via said switch body.