Overview:
In high-rise office buildings, an effective smoke management system is essential for fire safety, life protection, and property preservation. These buildings typically have floor areas of around 30,000 square feet, often divided into two major fire compartments by a central utility core housing staircases, lift lobbies, electrical rooms, and AHU rooms. Each of these compartments may be further subdivided using permanent or deployable fire curtains, resulting in up to four fire zones per floor. The Air Handling Unit (AHU) system is typically zoned accordingly to support both air distribution and smoke control.
Compartmentalization and Zoning:
This approach allows targeted smoke control by isolating fire-affected zones and maintaining tenable conditions in other areas for evacuation and firefighting. The smoke management system operates in coordination with fire-rated walls, fire doors, fire curtains, and zoned mechanical systems.
Smoke Management Strategies:
- Staircases and lift lobbies are pressurized to prevent smoke ingress, ensuring clear escape paths and access for firefighters.
- These systems activate automatically upon detection of fire or smoke.
- Smoke extraction fans remove smoke from the affected compartment.
- Motorized smoke dampers operate selectively based on fire zone, helping prevent cross-contamination between compartments.
- Extraction is often supported by relief openings or mechanical vents.
- Upon fire detection, AHUs serving the affected zone shut down automatically to prevent the spread of smoke through ducts.
- Fire and smoke dampers close to isolate air movement between compartments.
- Deployable or fixed fire curtains reinforce compartment boundaries during a fire, slowing smoke migration and allowing smoke extraction systems to operate effectively.
- They are especially useful in open-plan areas or where permanent walls are not feasible.
- The smoke management system is fully integrated with the building’s fire alarm system and Building Management System (BMS).
- System activation is triggered by automatic fire detection devices(e.g., smoke or heat detectors) located in each fire zone.
- Manual call pointsallow occupants or security personnel to manually trigger the fire alarm, which in turn initiates smoke control responses.
- This dual-mode activation (automatic and manual) ensures timely system response even in scenarios where one method fails or is delayed
- System status and control are monitored at the fire alarm panel and optionally at a central BMS or fire command center.
- Firefighters have manual override options for pressurization and extraction systems to adapt the smoke control strategy during emergency response.
The smoke management system is designed and implemented in accordance with the following Indian standards and guidelines:
- NBC 2016, Part 4 – Fire and Life Safety
- IS 8758 – Code of Practice for Smoke Control in Buildings
- IS 1646 – Code of Practice for Fire Safety of Buildings (General)
- IS 2189 – Selection, Installation and Maintenance of Automatic Fire Detection and Alarm System
