BS 7346-5:2005

Committees responsible
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
4 General recommendations
5 Recommended calculation procedure
6 Further acceptability criteria
7 Interaction with other fire protection systems and other
  building systems
Annex A (normative) Supporting documentation
Annex B (informative) Example of an iterative calculation
        procedure
Annex C (informative) Plugholing
Annex D (informative) Factors influencing the choice of
        time-dependent design fires
Bibliography

Provides functional recommendations and guidance on the calculation method for smoke and heat exhaust ventilation systems (SHEVS) for time-dependent design fires. A variety of building types is addressed.

This British Standard gives functional recommendations and guidance on the calculation method for smoke and heat exhaust ventilation systems (SHEVS) for time-dependent design fires. A variety of building types is addressed.

For a pre-determined critical time, this British Standard can be used to determine required performance of a SHEVS needed to avoid the onset of a significant danger. Or, for a pre-determined SHEVS, this British Standard can be used to determine the time available between ignition and onset of significant danger.

This British Standard uses accepted and authoritative methods to define some design parameters, e.g. the time needed for safe evacuation or attendance time of the fire-fighting services. This information can be sought from other sources when generating the overall fire-safety concept for a specific building project.

Many of the detailed calculation procedures, and most of the danger criteria defining the boundary between success and failure, are the same for time-dependent design fires as for steady-state design fires, and it is essential that this British Standard be used in conjunction with BS 7346-4.