Section 6. Recommendations 22 Recommendations for means of escape 22.1 Escape routes This code is concerned only with those additional measures that may be required to compensate for any increased risk resulting from the inclusion of an atrium within a building. It is not intended to provide a fire-engineered solution for any particular design. The solutions are not exhaustive and other methods may exist by which an equivalent level of fire safety can be achieved. All designs based on calculations to the extent recommended in this code can be considered to be a form of fire safety engineering, and should be supported by documentation fully detailing the calculations and assumptions made, and the values of any input parameters. In a building where the accommodation is separated from the atrium by smoke retarding construction, the means of escape from the accommodation should be in accordance with the recommendations of the codes for the equivalent non-atrium building. In a building where the accommodation is open to the atrium or not enclosed by smoke retardant construction, the following recommendations are applicable: a) storey exits should be sited away from the atrium so that escape routes do not approach the atrium edge;
b) maximum travel distances from the atrium, together with the associated areas, to the nearest storey exit should not exceed the distances appropriate to the equivalent non-atrium building; c) in category A and category B buildings, escape should be away from the atrium void and the subsequent escape route should not pass within 4.5 m of the atrium void (see Figure 7). The capacities of exits and means of escape should be in accordance with the recommendations of the appropriate codes for the equivalent non-atrium building.
Atrium void open or not enclosed by smoke retarding construction
Escape away from atrium
Figure 7 â€” Escape route on associated floor areas
ÂŠ BSI 8 December 2004