From natural AOVs to pressurisation systems, understanding smoke control is essential for fire safety. This guide covers all UK-approved approaches.. Why Smoke Control Matters Smoke is the primary killer in building fires. Effective smoke control systems maintain tenable conditions in escape routes, giving occupants time to evacuate safely. Types of Smoke Control Natural ventilation (AOVs) — Automatic Opening Vents at head of stairway/corridor Mechanical extract — Fans extracting smoke from corridors and lobbies Pressurisation — Maintaining positive pressure in stairways to prevent smoke ingress Smoke curtains — Channelling smoke in large open spaces CFD designed systems — Bespoke solutions for complex geometries Key Standards BS EN 12101 series — Components for smoke and heat control systems BS 7346 8 — Smoke control in covered car parks Approved Document B — Prescriptive requirements for smoke ventilation BS 9999 / BS 9991 — Risk based smoke control provisions Common Design Challenges 1. Corridor Ventilation For single stair residential buildings over 3 storeys, corridors must be ventilated. The choice between natural (1.5m² AOV) and mechanical (minimum 1.0m³/s per door) depends on building geometry. 2. Basement Smoke Extract Basements require dedicated smoke ventilation — typically mechanical — with inlet air provision at low level and extract at high level. 3. Car Park Ventilation Enclosed car parks require smoke ventilation to BS 7346 7. EV charging adds complexity due to different fire characteristics. For smoke control system design and CFD modelling, contact Magnus Opifex.