Smoke Control Systems

Smoke control is a complete life-safety system—not simply a fan, damper or length of fire-rated ductwork. The correct arrangement depends on the building, fire strategy, compartments served, escape and firefighting objectives, and the approved operating sequence.

This hub provides practical introductions to the principal smoke-control systems encountered in UK projects and explains where EN 1366 fire-resistance evidence, smoke-control ductwork, dampers, fans, controls and commissioning may need to be coordinated.

Choose the system you are working with

How the components fit together

A typical system may include smoke extract or supply fans, shafts and ductwork, smoke-control dampers, ventilators, replacement-air paths, pressure sensors, controls, emergency power and interfaces with the fire-alarm system. Each component has its own evidence, but the components must also operate together as the approved design intends.

• The fire strategy defines the life-safety and firefighting objectives.
• The smoke-control designer develops the operating method, duties and design calculations or CFD where required.
• The mechanical design coordinates fans, ductwork, dampers, pressure losses, access and services.
• The cause-and-effect matrix records which components operate for each fire scenario.
• Installation and commissioning verify that the completed system matches the approved design and responds correctly.

Where EN 1366 ductwork evidence becomes relevant

The ductwork route is fundamental. Smoke extract ductwork remaining within one defined compartment may follow a BS EN 1366-9 evidence route where applicable. A route serving or passing through multiple fire compartments may require BS EN 1366-8 evidence. Fire-resisting ventilation or supply ductwork may instead fall under BS EN 1366-1.

The standard number alone is not a specification. Classification, duration, pressure, leakage, orientation, size, supports, penetrations, access doors and any insulation or protection must all remain within the tested, classified or assessed system evidence.

Information to establish before pricing

• Current fire strategy and smoke-control design report.
• Drawings showing compartments, shafts, duct routes and discharge points.
• Cause-and-effect matrix and normal/fire-mode operating sequence.
• Fan duties, temperature classifications and standby arrangements.
• Required duct classification, duration, pressure and orientation.
• Damper schedule, supporting construction and penetration details.
• Power, controls, alarm interfaces and commissioning requirements.
• Applicable test, classification and field-of-application evidence.

Common coordination problems

• Selecting fans before the complete resistance and emergency duty are known.
• Treating a smoke shaft, fan, damper or duct as compliant in isolation.
• Leaving single- versus multi-compartment duct classification undefined.
• Assuming all dampers open together without an approved sequence.
• Changing duct sizes, supports or penetrations outside the system evidence.
• Failing to coordinate replacement air, pressure relief and escape routes.
• Commissioning individual components without proving the full cause-and-effect sequence.

Request a ductwork scope review

Send the available fire strategy, smoke-control report, drawings, fan schedule and ductwork requirements for an initial review. This can help identify missing information and establish a clearer basis for fire-rated ductwork manufacture, insulation and installation.

Important: This hub provides general coordination guidance only. The fire engineer, smoke-control designer, project consultants and approving parties remain responsible for the project strategy and design. Final operation must follow the approved cause-and-effect matrix and commissioning requirements.

Guidance review: September 2026. This is an original practical summary and does not reproduce or replace the relevant standards or project evidence. How this guidance is reviewed.