Only specific dampers shall be used in HVAC systems designed to operate with fans on during a fire. What type is specified?

In HVAC systems that are designed to operate with fans during a fire, dynamic systems dampers are specified because they are designed to respond to changing conditions. These dampers can automatically adjust in real-time to the airflow and pressure changes that occur during a fire scenario, allowing for better control of smoke and heat. Their ability to react dynamically makes them suitable for applications where maintaining airflow for safety and fire control is critical.

Static dampers typically do not move or respond to airflow changes, which makes them less effective in dynamic situations such as a fire. Fire suppressing dampers might suggest some form of fire protection but may not provide the necessary control or operation under fan-driven conditions. Manual dampers require human intervention to operate, which is not practical in emergency scenarios where immediate response is imperative. Thus, dynamic systems dampers are essential for maintaining operational effectiveness during a fire, ensuring compliance with safety regulations while protecting occupants and property.