Page 72

BS 5588-7:1997

Pressure differential smoke control system

Enclosed fire-resisting construction

PHE

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

AFD/VA

PHE

PHE

AFD/VA

≤ 30 m

AFD/VA

AFD/VA

AFD

Atrium base: controlled fire load

Make-up air

Make-up air

AFD/VA denotes L2 automatic fire detection within the atrium and associated floor areas and voice alarm throughout the building AFD denotes automatic fire detection connected to building alarm system PHE denotes phased evacuation denotes automatic sprinkler protection will only be required as part of the fire engineering solution a) Pressure differential systems using atria depressurization NOTE Pressure differential systems using smoke exhaust ventilation to de-pressurize the atrium with a high neutral plane method [see 17.1c)3) and 24.6d)].

Exemplar 6 — Occupancy category A (occupants who are awake and, predominantly, are familiar with the building): enclosed 30 m or less in height, fire-resisting, pressure differential, phased evacuation

66

© BSI 8 December 2004

Bs 5588 71997 fire precautions in the design, construction a  
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