Atriums and large open spaces are striking architectural features in modern commercial buildings. However, they present unique fire safety challenges. Smoke can fill large volumes quickly, and natural buoyancy may be insufficient to keep escape routes clear. Security Red Alert is a trusted Fire alarm installation and Servicing company specializing in smoke ventilation for atriums across London. With over 20 years of experience, we deliver BS 7346 compliant smoke control solutions for shopping centres, hotels, offices, and other commercial properties.

We also provide Smoke Ventilation systems for atriums and large spaces. Our SSAIB approved team serves Croydon, Wandsworth, Lambeth, Sutton, and all South London areas.

Why Atriums Need Special Smoke Ventilation

Atriums and large open spaces have unique characteristics that make standard smoke ventilation inadequate. Large volume means smoke can fill a vast space before detection. High ceilings allow smoke to stratify at high levels, not reaching ceiling-mounted detectors. Open design allows smoke to spread to multiple floors or areas. Complex airflow patterns may prevent natural smoke buoyancy from working effectively. Multiple escape routes serve different levels, all potentially affected by smoke migration.

Smoke ventilation for atriums must be specifically designed to address these challenges, maintaining a smoke-free layer above occupied areas and keeping escape routes clear.

Types of Atrium Smoke Ventilation Systems

Natural smoke ventilation uses automatic opening vents at the atrium roof level, relying on natural buoyancy of hot smoke. This works for smaller atriums with adequate roof access. Mechanical smoke extraction uses fans to actively extract smoke, required for larger atriums or where natural ventilation is insufficient. Atrium smoke clearance systems are designed to maintain a smoke-free layer at a specified height, protecting occupants below. Combined systems use both natural and mechanical methods for complex atrium designs.

How Atrium Smoke Ventilation Works

A typical atrium smoke ventilation system includes smoke detectors at multiple levels to detect fires regardless of where they start. Extraction fans or vents at the highest point remove smoke from the atrium. Make-up air inlets at lower levels allow fresh air to enter, maintaining airflow. The control panel manages system operations and interfaces with the fire alarm. The system is designed to maintain a smoke-free layer at a specified height, ensuring safe evacuation.

BS 7346 Compliance for Atrium Systems

BS 7346-4 covers smoke and heat exhaust ventilation systems for buildings including atria. Key requirements include system activation within 60 seconds, adequate extraction capacity for the atrium volume, maintenance of a smoke-free layer at specified height, automatic and manual activation methods, and fail-safe operation.

Frequently Asked Questions

Do all atriums need smoke ventilation?
Yes, most atriums require smoke ventilation under Building Regulations. Requirements depend on atrium size, height, and building use.

What is a smoke-free layer?
A smoke-free layer is a zone below the smoke-filled upper area where occupants can safely evacuate. Atrium smoke ventilation maintains this layer at a specified height.

How fast does atrium smoke ventilation activate?
BS 7346 requires activation within 60 seconds of fire detection. Security Red Alert systems meet this requirement.

Can smoke ventilation be integrated with fire alarms?
Yes. Security Red Alert provides fully integrated systems where fire alarms trigger smoke ventilation automatically.

What is the difference between natural and mechanical atrium ventilation?
Natural uses roof vents relying on smoke buoyancy. Mechanical uses fans to actively extract smoke. Larger atriums need mechanical systems.

Conclusion

Smoke ventilation for atriums and large open spaces requires specialized design to protect occupants and property. Security Red Alert has over 20 years of experience providing smoke ventilation for commercial buildings across South London. Contact us today for your free site survey and quote.