Spring-operated "separate function" control mechanism, used in fire ventilation cut-off dampers – current impulse control
In this type of mechanisms, the transition to the safety position is initiated by an electromagnetic release that releases the bolt of the spring drive of the damper., while moving to an item …
During normal operation of ventilation and air conditioning systems, fire dampers remain open, Fire ventilation cut-off dampers, however, remain closed. During the normal operation of the facility, both cut-off fire dampers and fire ventilation cut-off dampers, so they remain in a waiting position. …