1. Ensure effective fire compartmentation
A fundamental principle of fire safety is to limit the spread of fire, smoke, and hot gases between different parts of a building. Fire compartmentation creates zones designed to contain a fire for a specified period of time.
Where ventilation ducts pass through fire compartment boundaries, both the ducts and the associated penetrations must be designed and sealed to prevent the spread of fire, smoke, and hot gases. Even minor leakage around duct penetrations can compromise the integrity of the fire compartment.
2. Position fire dampers strategically
Fire dampers are among the most important fire safety components in a ventilation system. They are typically installed where ducts penetrate fire-rated walls or floors and close automatically in the event of a fire to prevent the spread of fire and smoke.
In addition to correct placement, selecting the appropriate damper type is essential. This may include combined fire and smoke dampers classified in accordance with EN 15650. Installation must also be carried out in accordance with the manufacturer's instructions, as improper installation can affect both the damper's performance and fire classification.
3. Integrate ventilation, fire alarms and control systems
Effective fire safety relies on the coordinated operation of multiple technical systems. Air handling units (AHUs), fire dampers, smoke detectors, smoke extract fans and fire alarm systems must be able to communicate and respond automatically in the event of a fire, without requiring manual intervention.
When these systems are properly integrated, a sequence of actions can be initiated as soon as an alarm is triggered. AHUs can be shut down, dampers closed and smoke extraction activated. It is also important to establish clear priorities within the control system to ensure that fire safety functions always override normal operating modes.
4. Use ventilation as part of the smoke control strategy
Modern buildings often use active smoke control systems to manage the movement of smoke and hot gases during a fire. The objective is to protect escape routes, limit smoke spread and support firefighting operations.
Depending on the building design, the system may operate in different modes based on the location of the fire. This requires careful design, commissioning and verification through methods such as pressure testing, functional testing or simulation.
5. Test and maintain the system regularly
A fire-safe ventilation system requires ongoing inspection and maintenance to ensure reliable operation. Regular inspections and functional testing should be carried out on fire dampers, detectors, control systems and ductwork. Test results should be documented to support ongoing compliance and facilitate future inspections.
In larger or more complex buildings, continuous system monitoring is equally important. Faults affecting dampers, sensors or communications should be detected and rectified at an early stage, rather than only becoming apparent during an actual fire event.