5BS 9999 – typical applications: Further education college – compartment area/exit widthsLeisure centre – compartment area/exit widthsOffice refurbishments – increased occupanciesNew offices – reduced exit widths
6BS pick and mix?Applying the travel distance and exit sizing in isolation:Interrelations difficult to pinpoint (voids, basement stairs etc)Essential that a thorough review of fire safety features in consideredReduced scope for fire engineering with BS 9999?
7BS 9999 – A personal perspective from a fire engineer Points to consider:Efficiency of narrower 850mm exits – need to exercise judgement?Nightclub4 x 850mm exits4.5m ceilingL2 detection system
8BS 9999 – A personal perspective from a fire engineer ADB:Exits provide capacity for 330 peopleNightclub4 x 850mm exits4.5m ceilingL2 detection system110110110
9BS 9999 – A personal perspective from a fire engineer Risk profile B2?Door widths base on minimum measures = 4.1mm/personReduction due to L2 detection and ceiling height = 3.3mm/person = 257 people/exit = 771 total (more than twice ADB)Nightclub4 x 850mm exits4.5m ceilingL2 detection system257257257
10BS 9999 – A personal perspective from a fire engineer “Where premises contain provisions for the consumption of alcoholic beverages then a reduction in the travel distances of 25% might be advisable”“where a room is crowded, the time to evacuate becomes less dependent upon the travel distances and more dependent upon queuing behaviour at the exits and so door capacity becomes the critical feature of the design”
11BS 9999 – a missed opportunity? Fire fighting measures:Very similar to BS 5588 Part 5Requirements for FF Shafts still based on purpose groups rather than riskSprinkler concessions similar to ADBConflict between Table 19 and Table 21?
12BS 9999 – Summary A welcome addition to the engineers tool-kit A few areas of ambiguity (keeps me in a job!)Needs a thorough understanding to apply appropriately, and check adequacy of solutions