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  • BSI
    BS 5925:1991 Code of practice for ventilation principles and designing for natural ventilation
    Edition: 1991
    $473.45
    / user per year

Description of BS 5925:1991 1991

This British Standard gives recommendations on the principles which should be observed when designing for the natural ventilation of buildings for human occupation. The standard is in three sections, as follows:

  1. Section 1. General

  2. Section 2 outlines the main reasons for the provision of ventilation and, where possible, recommends quantitative air flow rates. It is shown that these form the basis for air supply recommendations for different types of buildings and rooms characterized by usage. The basis for the choice between natural and mechanical ventilation is given. The design of mechanical ventilation systems is dealt with in BS 5720.

  3. Section 3 gives recommendations on the design of natural ventilation systems and on the estimation of air infiltration rates in housing.

  4. Appendix A is a bibliography and reference to publications listed in it are shown as: (see Appendix A [15]).

  5. Appendix B gives recommendations on evaluating contamination risks.

  6. Appendix C gives recommendations on calculating ventilation rates to reduce the risk of surface condensation under steady state conditions.

  7. Appendix D gives recommendations on determining ventilation requirements.

  8. Appendix E gives recommendations on calculating reference wind speed.

  9. Appendix F gives recommendations on calculating natural ventilation rates for a simple building.

This standard does not attempt to address thermal comfort aspects of ventilation such as indoor air movement, temperature stratification, exact position of ventilation openings etc.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.



Recommendations for designing for the natural ventilation of buildings for human occupation. Reasons for the provision of ventilation and, where possible, recommends quantitative air flow rates. The basis for the choice between natural and mechanical ventilation and guidance on the design of natural ventilation systems.

Standard NumberBS 5925:1991
TitleCode of practice for ventilation principles and designing for natural ventilation
StatusConfirmed
Publication Date1991-05-31
ReplacesBS 5925:1980
DescriptorsAir bricks, Flueless heaters, Humidity control, Mechanical ventilation, Openable areas, Fire safety in buildings, Odours, Air changes, Temperature, Gas-powered devices, Bibliography, Opening windows, Natural ventilation, Rooms, Ventilation, Formulae (mathematics), Windows, Smoke extraction (buildings), Air pollution, Wind loading, Side-hung windows, Air, Gas flow, Air grilles, Thermal comfort, Architectural design, Winds, Buildings
ICS91.140.30 Ventilation and air-conditioning systems
CommitteeB/540
ISBN0 580 19285 7
PublisherBSI
Pages48

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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