Designers of car park ventilation installations need to take into account an array of regulations, standards and guidelines. Richard Brooks and Keith Elves explain
esigning to control the flow of smoke within a car park – often referred to as the ‘enhanced’ ventilation system – is covered in
BS7346: Part 7 under section 10 (fire fighter access) and section 11 (means of escape). These two sections deal with a ‘fire engineered’ approach to the design of the smoke ventilation system under fire conditions and require the design to be based on an agreed design fire load. The principle for a smoke control design requires the volumetric performance of the main extract fans to be sufficient to extract the mass of smoke generated by a design fire load, the size of the design fire preferably
42 CIBSE Journal July 2012
having been agreed with the regulatory authority prior to embarking on a detailed design. The performance of the main extract
fans will also be required to create sufficient velocity through the fire zone, to enable the jet fans to control the flow of smoke as well as overcome the buoyancy effect of the hot smoky gases. A further fundamental element of the
system design will be the installation of an addressable fire detection system, which will ‘communicate’ the affected fire zone to the master control panel, which in turn will activate the appropriate jet fans to direct the smoke to the extract location. The automatic
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