Car Park Smoke & Fume Extraction
Jet fan and mechanical extract systems requiring annual performance testing.
Why Car Park Ventilation Matters
Enclosed and basement car parks present unique fire and life safety challenges. Vehicle fires generate toxic smoke at extraordinary rates, and carbon monoxide from idling engines can reach lethal concentrations in poorly ventilated spaces. Effective smoke control and fume extraction systems are essential to maintain tenable conditions for evacuation and firefighting access.
Modern car park ventilation typically combines impulse jet fans with mechanical extract fans. Jet fans create horizontal airflow patterns that direct smoke towards extract points, while mechanical fans physically remove smoke from the space. CO sensors trigger the system during normal operation when exhaust fume levels rise, and fire alarm integration activates smoke extraction mode during fire events.
BS 7346 Part 7 specifies annual testing requirements including CO sensor calibration, jet fan rotation verification, airflow measurements, and fire override function testing. Failure to maintain these systems can result in untenable smoke conditions, prosecution under fire safety legislation, and insurance invalidation.
Compliance Standards
BS 7346-7
Components for smoke and heat control systems – Code of practice on functional recommendations and calculation methods for smoke and heat exhaust ventilation systems, employing steady-state design fires, for covered car parks.
Approved Document B
Building Regulations guidance on fire safety, including requirements for smoke ventilation in car parks. Specifies minimum ventilation rates and smoke control strategies.
Regulatory Reform (Fire Safety) Order 2005
Requires the Responsible Person to maintain smoke control systems in enclosed car parks. Non-compliance can result in prohibition notices and prosecution.
Testing Requirements
CO Sensor Calibration
Annual calibration using certified CO gas. Verifying sensor response times, alarm thresholds, and integration with ventilation control systems. Sensors typically require replacement every 5-7 years per manufacturer specifications.
Jet Fan Rotation Tests
Verifying each jet fan operates correctly in both forward and reverse modes (where applicable). Checking for unusual vibration, bearing noise, or reduced thrust indicating mechanical wear.
Fire Override Tests
Simulating fire alarm activation to verify that the ventilation system switches into fire mode, activating smoke extraction sequences and overriding normal CO-based control. Testing integration with fire alarm panel and BMS.
Airflow Verification
Using anemometers to measure air velocity and verifying that jet fan thrust and extract fan capacity meet design specifications. Identifying blockages or obstructions that impair airflow.
Risks of Non-Compliance
Untenable Smoke Conditions
Failed ventilation systems allow smoke to accumulate, creating visibility below 10 metres and exposing occupants to toxic gases. Vehicle fires can reach temperatures exceeding 1000°C within minutes.
Carbon Monoxide Poisoning Risk
Inadequate CO monitoring or faulty sensors allow dangerous fume concentrations to develop. Even low-level exposure causes headaches and dizziness; high concentrations are rapidly fatal.
Legal and Operational Consequences
Fire authorities can issue prohibition notices, closing car parks until systems are compliant. The Responsible Person faces prosecution and unlimited fines under fire safety legislation.
Ensure Compliant Car Park Ventilation
Get a fixed-price proposal for annual testing, CO sensor calibration, and emergency callout support. Our engineers specialise in complex jet fan and extract systems.