Patent ID: 6093229
Filing Date: 2000-07-25
Classification: B01D,Y10S

Abstract:
A fan drive checking system for an air conditioning system in a clean room having a fan filter unit (FFU) including a housing located in the ceiling of the clean room, and a filter disposed in the housing, the fan drive checking system comprising:a flow sensor, disposed above the filter and inside the housing of the FFU, for sensing air flow inside the housing and providing a sensor signal indicative of normal and adverse flow conditions in the housing, the normal flow condition being a flow of the air in a downward direction sequentially from a location above the filter, through the filter, and to a location below the filter and into the clean room;a control portion in data communication with the sensor for outputting a control signal responsive to the sensor signal; andan alarm in data communication with the control portion for providing a warning when the control signal indicates the adverse flow condition.