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Fire dampers are important safety devices used in heating, ventilation, and air conditioning (HVAC) systems to prevent the spread of fire and smoke within buildings. They are specifically designed to close automatically in the event of a fire to restrict the passage of flames and smoke through ductwork or ventilation openings.
How fire dampers work:
Passive Fire Dampers: Passive fire dampers operate based on thermal or fusible link mechanisms. When the ambient temperature near the damper exceeds a certain threshold due to a fire, the fusible link melts or the thermal element expands, triggering the damper to close. This action blocks the airflow and prevents the fire and smoke from spreading to other parts of the building through the ducts or ventilation pathways.
Motorized or Powered Fire Dampers: These fire dampers are similar to passive fire dampers but have an additional power-driven mechanism for controlling their operation. They may be integrated into the building’s fire alarm system or smoke detection system. When the fire alarm or smoke detector is activated, it sends a signal to the motorized fire dampers, causing them to close automatically. These dampers may also have manual overrides or testing functionalities for maintenance purposes.
It’s crucial to regularly inspect, test, and maintain fire dampers to ensure their proper functioning when needed. Building codes and regulations often dictate the installation, maintenance, and testing requirements for fire dampers to ensure maximum safety.
Please note that while I strive to provide accurate and up-to-date information, it’s possible that there have been advancements or changes in fire damper technology or regulations beyond my last knowledge update in September 2021. For the most current and specific information, it’s best to consult relevant HVAC experts or local building codes and authorities.”