overview:
The staircase pressurization system is a vital life safety feature in high-rise buildings. Its main function is to maintain positive air pressure within stairwells during a fire to prevent smoke infiltration. This ensures a safe, smoke-free escape route for occupants and provides clear access for emergency responders.
Staircases are considered safe zones during a fire. To preserve their integrity, staircases shall be enclosed and equipped with fire-rated doors at each level. These fire doors help prevent smoke and flames from entering the stairwell, supporting the effectiveness of the pressurization system.
When a fire is detected on any floor of the building, the pressurization system shall be automatically activated via the fire alarm or smoke detection system to pressurize the staircases immediately.
Why Staircase Pressurization Is Essential:
In the event of a fire, smoke tends to rise and travel through vertical shafts. Pressurizing staircases prevents smoke from entering, keeping them usable during emergencies.
Helps maintain clear visibility and breathable air within stairwells to support the safe evacuation of building occupants.
Ensures that firefighters can safely ascend through smoke-free stairs to reach and fight the fire.
System Components:
Introduce fresh air into the stairwell to maintain positive pressure.
Distribute pressurized air evenly across all floors.
Continuously monitor pressure levels to ensure proper system performance.
Integrated with the building’s fire alarm system. The system activates automatically when fire or smoke is detected on any floor.
Prevent excessive pressure buildup, which could make doors difficult to open.
Design Requirements (as per Indian and international standards):
A pressure difference of 50 to 60 Pa must be maintained between the stairwell and adjacent areas, in accordance with NBC 2016 Part 4, Clause 4.6.2.1 and IS:4021.
All staircases shall be enclosed with fire-rated doors at each entry point to maintain their role as protected escape routes.
Fans must be placed in protected areas and connected to an emergency power supply, as specified in NBC 2016 Part 4, Clause 4.6.2.2.
The system shall start automatically when smoke or fire is detected anywhere in the building.
Manual control must be provided for use by the fire service.
Pressure relief dampers must be included to prevent over-pressurization, as required by NBC 2016 and IS:4021:1967 (Code of Practice for Maintenance of Air Pressure in Staircases).
