In multi-storey buildings, effective air pressure control is fundamental to the safe operation of protected escape routes. Stairwells, lobbies, and firefighting shafts must remain clear of smoke during a fire, while still being easy to use under evacuation conditions. Achieving this balance relies heavily on the correct specification and application of air pressure stabilisers.
Selecting the right air pressure control solution is not simply a matter of airflow. It requires an understanding of building height, leakage paths, fan performance, and how the system behaves under real fire conditions.
The role of air pressure stabilisers in pressurisation systems
Air pressure stabilisers are a critical component within pressure differential systems. Their primary function is to regulate airflow to maintain a stable pressure within protected escape routes, even as conditions change.
During a fire scenario, pressurisation fans introduce air into the stairwell or lobby to prevent smoke ingress. Without an effective stabiliser, pressure can quickly rise beyond acceptable limits, making doors difficult to open and potentially breaching regulatory requirements. An air pressure stabiliser relieves excess air when pressure exceeds the design set point, ensuring the system remains within safe operating limits.
What to look for when specifying an air pressure stabiliser
Pressure control accuracy
For protected escape routes, pressure differentials are relatively low but tightly defined. The stabiliser must operate accurately within this range to ensure compliance while avoiding excessive door opening forces.
Airflow capacity
The stabiliser must be capable of handling the maximum airflow delivered by the pressurisation fan under worst case conditions. This includes scenarios where all doors are closed and external influences are unfavourable. Both under-sized and over-sized devices can lead to poor system performance.
Reliability under dynamic conditions
Conditions can change constantly. A suitable stabiliser must respond reliably to sudden pressure changes caused by door movement while maintaining stable operation throughout the system’s duty range.
Installation and maintenance considerations
Air pressure stabilisers are often installed in plant rooms, risers, or directly within protected spaces. The selected unit must suit the available installation location and allow reasonable access for inspection and maintenance over the life of the building.
Air pressure stabilisers for protected escape routes
Purpose-designed air pressure stabilisers are essential for pressurisation systems serving stairwells, lobbies, and firefighting shafts. These devices are typically free-blowing or duct-mounted and operate purely on pressure differential, ensuring dependable performance even in the event of power failure elsewhere in the system.
Aercon manufactures air pressure stabilisers specifically for these applications. Aercon’s SP and T ranges of air pressure stabilisers are widely used in stairwell and lobby pressurisation systems, providing stable and predictable pressure control across a broad range of airflow conditions. Both ranges are developed to support compliance with UK building regulations and commonly referenced smoke control standards, with performance characteristics suited to real-world pressurisation challenges.
The value of specialist support
Pressurisation systems are life safety systems, and early engagement with a specialist manufacturer can significantly reduce risk during both design and commissioning. Air pressure stabilisers must be matched carefully to fan performance, building leakage assumptions, and the intended pressure regime.
By working with Aercon, designers and contractors can ensure that the selected SP or T range stabiliser is appropriate for the application. This support helps to avoid issues such as excessive door forces, unstable pressure control, or costly late-stage modifications. Specialist input can also assist with system sizing, layout considerations, and commissioning strategy, all of which contribute to a smoother project delivery and more reliable long-term operation.
Supporting safe escape routes through correct air pressure control
Getting air pressure control right is essential to delivering safe, compliant, and effective pressurisation systems in multi-storey buildings. Correctly specified air pressure stabilisers play a central role in maintaining smoke-free escape routes that remain usable when they are needed most.
By understanding the demands placed on these systems and selecting purpose-designed solutions such as Aercon’s SP and T ranges, designers and building owners can achieve reliable performance, regulatory compliance, and long-term operational confidence.
For project-specific advice on air pressure stabilisers and pressurisation systems for protected escape routes, Aercon’s technical team is available to provide support from early design through to commissioning. Engaging early helps ensure the right solution is in place from the outset.
