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Commercial ventilation

Car park ventilation systems

Jet fan and extract systems with CO detection for enclosed car parks.

  • From £24,950 + VAT per scheme
  • Free survey on the UK mainland
  • Airflow tested and recorded
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Jet fans on the ceiling of an underground car park

Enclosed and underground car parks need mechanical ventilation to clear vehicle exhaust in normal use and, in many designs, to help clear smoke in a fire. We install and maintain jet fan and ducted extract systems with carbon monoxide detection and controls.

How it works

Approved Document B sets out ventilation provisions for enclosed car parks, commonly 6 air changes an hour for normal use and 10 in fire conditions where mechanical ventilation is used. CO detection lets the system run at low speed most of the time and boost when pollution rises.

Smoke control aspects are designed with the building's fire strategy and fire engineer. We install, commission and maintain the systems and the detection that runs them.

Options we fit

Jet fan systems

Ceiling-mounted fans moving air towards extract points.

Ducted extract

Traditional ducted systems where layout suits.

CO and NO2 detection

Sensors and controls for demand-led running.

Maintenance

Planned testing of fans, sensors and controls.

Signs you need this

  • A new underground or podium car park
  • Detection that alarms constantly or never
  • Fans failing or running flat out all day
  • Fumes noticeable in stairwells
  • Insurer or fire risk assessment actions
  • Refurbishment of an older car park

Guide prices

Car park ventilation guide prices
WorkGuide price
Enclosed car park ventilation: jet fans, controls and CO detection (per scheme)£24,950–£89,950 + VAT

Guide prices using West Midlands (our baseline) rates. Home prices include VAT at 20%; business prices exclude VAT. A guide price is not a quote: we confirm a fixed price in writing first. London is about 20% higher and the North East about 8% lower.

What happens, step by step

  1. Review

    Fire strategy, drawings and existing plant.

  2. Design input

    Fan layout and controls with the designer or fire engineer.

  3. Install

    Fans, detection, controls and wiring.

  4. Commission

    Modes tested with the fire alarm interface.

  5. Maintain

    Planned servicing and records.

The rules that apply

England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Approved Document B sets the ventilation provisions for enclosed car parks, commonly 6 air changes an hour for normal use and 10 in fire conditions.

Wales

Wales has its own Part F ventilation guidance, published by the Welsh Government, and work is checked by building control. Welsh Approved Document B covers car park ventilation, with rates confirmed in the fire strategy.

Scotland

In Scotland, ventilation is covered by the Building (Scotland) Regulations and section 3 of the Technical Handbooks, and most building work needs a building warrant first. In Scotland, car park ventilation is covered by the Technical Handbooks and the building's fire strategy.

Northern Ireland

In Northern Ireland, ventilation is covered by the Building Regulations (Northern Ireland) and Technical Booklet K. In Northern Ireland, car park ventilation follows the Technical Booklets and the building's fire strategy.

Questions people ask

How much does car park ventilation cost?

Car park schemes are survey-priced; jet fan systems with CO detection typically start from around £24,950 excluding VAT and rise with size and fire requirements.

What ventilation rate does a car park need?

Mechanically ventilated enclosed car parks are commonly designed for 6 air changes an hour in normal use and 10 in fire conditions, following Approved Document B guidance.

What are jet fans?

Jet fans are ceiling-mounted fans that push air along the car park towards extract points, replacing much of the ductwork.

Do you design smoke control?

Smoke control is designed with the building's fire strategy and fire engineer; we install, commission and maintain the equipment.

How often should car park fans be tested?

Fans, detection and controls should be serviced and tested on a planned schedule, often twice a year, as set out in the maintenance plan.

Can you repair existing systems?

Yes. We repair fans, sensors and controls on existing systems.

Related services

Galvanised ductwork hung from the roof of an industrial unit

Ductwork installation

Spiral and rectangular galvanised ductwork, hung, insulated and sealed.

From £45 + VAT per metre

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