Mechanical Fire Dampers
Fire Dampers are typically intended to be used as part of the HVAC duct system when passing through a fire rated barrier (walls, partitions, floors). The trigger mechanism is a heat fusible link that when activated, impedes the migration of high temperatures into and through the duct system.
UL, AMCA and Damper Manufacturers Require "once every 6 months" Damper/Actuator cycling to ensure proper operation of fire/smoke and smoke rated Dampers during a Fire event.
Fusible links
Fusible links are temperature sensitive fire protection devices designed to be part of a fire protection system. The system is activated when the ambient temperature increases to the point that causes the fusible link to "break-apart". At the point of breakage, it releases the pre-loaded fire protection device, thus restricting the spread of fire.
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