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In large commercial buildings, office buildings, industrial facilities, underground spaces, and mixed-use complexes, fire compartments are an important part of the building fire safety system. During a fire, smoke can spread faster than flames. If the ventilation system is not properly designed, smoke may travel through ventilation ducts, shafts, and other pathways into adjacent areas. Therefore, a fire compartment ventilation protection solution should integrate normal ventilation, smoke extraction, fire separation, and equipment linkage to maintain everyday air circulation while reducing the risk of smoke spreading across fire compartments.
Office buildings, shopping centers, and industrial facilities usually contain extensive ventilation duct networks. When ducts pass through different fire compartments, inadequate fire protection measures may allow high-temperature smoke generated by a fire to travel through the ductwork into other areas.
Therefore, appropriate fire protection measures should be implemented where ventilation ducts pass through fire-rated walls, floors, and other fire separation elements, in accordance with the applicable building and fire safety requirements.
Large buildings typically contain multiple floors, functional zones, and vertical transportation spaces, creating complex airflow paths. During a fire, if the ventilation system continues operating in normal mode, it may interfere with smoke control.
A reliable fire compartment ventilation system should therefore be designed based on the building structure, fire compartment layout, and overall smoke control strategy.
Fire dampers are important components of ventilation fire protection systems. Where ventilation ducts pass through fire-rated separation structures, appropriate fire dampers can be installed according to the project design requirements. Under fire conditions, these dampers can interrupt specific airflow paths and reduce the risk of flames and high-temperature smoke spreading through the duct system.
The type, fire-resistance performance, installation location, and control method of fire dampers should be selected according to the project design and applicable fire safety standards.
Ventilation duct design should consider not only airflow and system resistance but also the boundaries between fire compartments. Designers should minimize unnecessary cross-compartment ductwork and properly plan shafts, ducts, and ventilation equipment locations.
Where ducts must pass through fire-rated separation structures, appropriate firestopping and insulation measures should be used to maintain the integrity of the building's fire separation.
The main purpose of a smoke exhaust system is to remove smoke promptly and improve visibility and environmental conditions in evacuation areas. Mechanical smoke exhaust systems should be designed according to the building structure and fire risks in areas such as underground parking garages, commercial spaces, and large industrial facilities.
Makeup air should also be considered when designing smoke exhaust systems. Proper makeup air can help establish stable airflow and prevent insufficient air supply from affecting smoke exhaust performance.
| Building Area | Main Risks | Recommended Ventilation Measures | Design Focus |
|---|---|---|---|
| Office Buildings | Cross-compartment smoke spread | Fire dampers + mechanical smoke exhaust | Prevent smoke from entering adjacent areas |
| Commercial Complexes | High occupancy, complex spaces | Zoned smoke exhaust + makeup air | Maintain suitable conditions in evacuation areas |
| Underground Parking | Vehicle emissions, fire smoke | Mechanical smoke exhaust + makeup air | Quickly remove smoke |
| Industrial Facilities | Heat, smoke, dust | Independent smoke exhaust + fire separation | Design according to production processes |
| Equipment Rooms | Heat, equipment failures | Independent ventilation + fire protection | Control temperature and reduce fire risks |
| Stairwells and Lobbies | Smoke infiltration | Pressurization air supply | Maintain pressure in protected areas |
Modern building ventilation systems can be integrated with automatic fire alarm systems. When a fire detector confirms a fire signal, the system can follow predefined control logic to operate supply fans, smoke exhaust fans, fire dampers, and smoke dampers, allowing the ventilation system to switch from normal operation to fire safety mode.
Different fire compartments may have different smoke control requirements. A zoned control strategy can therefore be used. During a fire, only the smoke exhaust and makeup air equipment serving the affected area needs to operate according to the designed sequence, while ventilation equipment in other areas can be shut down or adjusted as required.
An intelligent control platform can monitor the operating status of fans, dampers, and sensors and identify equipment faults in a timely manner. In large buildings, ventilation equipment can also be integrated into a building management system, allowing facility managers to monitor and manage the system centrally.
For areas with higher fire safety requirements, dedicated smoke exhaust systems should be designed according to the building function. This helps reduce potential interference between ordinary ventilation and fire smoke control systems.
When ventilation ducts, cables, and other services pass through fire compartments, the penetration points should be properly firestopped. Firestopping systems should not only meet fire-resistance requirements but also account for building movement, long-term operation, and future maintenance.
Fire dampers normally remain in standby mode for long periods and can therefore be overlooked during routine maintenance. Regular inspections should cover damper operation, fan performance, control wiring, and smoke exhaust equipment. Dust accumulation, mechanical faults, and control abnormalities should be addressed promptly.
A fire compartment ventilation protection solution is not simply a matter of installing fire dampers or smoke exhaust fans. It requires an integrated approach covering fire compartment planning, ventilation ductwork, fire dampers, mechanical smoke exhaust, makeup air, intelligent controls, and regular maintenance.
For office buildings, commercial complexes, industrial facilities, underground parking garages, and large public buildings, ventilation and fire protection systems should be customized according to the building structure and functional requirements.
Through optimized duct design, reliable fire separation, effective mechanical smoke exhaust, and intelligent equipment coordination, buildings can achieve stronger fire protection capabilities while maintaining effective everyday ventilation. A well-designed system provides a more reliable ventilation environment and supports safer evacuation and overall building fire safety.
