AIR CONDITIONING 2 CAR PARKS


fire detection system associated with the enhanced smoke control systems should be installed with the correct specification of fire alarm equipment and specification of cable. The fire detection signal equipment should latch onto the original signal and be capable of being amended, possibly by manual override, at the master panel. However: lFire alarm interface boxes should not be located within the car park;


lFire detector heads (especially smoke detectors) should not be sited in locations which could cause false alarms; and


lThe fire detection system should not be interfaced with any primary or secondary lighting installations.


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For larger car parks, more than one point


of extract may be necessary to provide for efficient smoke control. In such cases, each extract point must be capable of extracting the volume of air calculated for the agreed fire load referred to above. Selective operation of the jet fans associated with the affected fire zone will direct the smoke to the appropriate extract location by the most efficient route. The jet fans will induce air from other areas outside the fire zone, trapping the smoke within a predetermined corridor or path. The objective here is to protect unaffected zones, escape routes and fire fighter access routes from smoke contamination. All jet fans, other than


For larger car parks, more than one point of extract may be necessary to provide for efficient smoke control


July 2012 CIBSE Journal 43


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