BS 5588-4:1978

Foreword
Drafting committee
Code
1 Scope
2 References
3 Definitions
4 The building
5 The system
6 The installation and equipment
7 General
Appendix
A A worked example
Tables
1 Pressurization levels
2 Values of (P) to the power 1/N for N = 2 and N = 1.6
3 Typical leakage areas for four types of door
4 Air leakage data for doors
5 Air leakage data for windows
6 Values of factor F for various vent sizes
7 Values of K
8 Airflow through an open door: staircase only
    pressurized: staircase/accommodation door open
9 Airflow through an open door: staircase and lift
    lobby pressurized to same level: airflow when one
    lobby/accommodation door is open
10 Airflow through two open doors: staircase and lift
    lobby pressured to the same level: two lobby doors
    (stairwell/lobby and lobby/accommodation) open on
    same floor
11 Minimum total length of window cracks (per floor)
    for satisfactory venting of the pressurizing air
12 Suggestions for choice of venting system
Figures
1 Pressurizing staircase only
2 Deleted
3 Pressurizing staircase and lift lobby
4 Leakage paths in series
5 Leakage paths in parallel
6 Steps in obtaining the equivalent resistance of a
    combination of series and parallel paths of air
    leakage
7 Diagram of leakage from lift landing doors
8 Diagram of airflow conditions listed in table 8
9 Diagram of airflow conditions listed in table 9
10 Diagram of airflow conditions listed in table 10
11 Plan of building for worked example

Recommendations for a method for keeping protected escape routes in buildings clear of smoke by pressurizing the escape routes. The method is an alternative to the natural ventilation required by CP 3:Ch IV and certain building acts and regulations.