Discusses the many complex factors that determine the behaviour of air streams within rooms and that influence the resulting thermal environment. In addition provide guidance on good design practice in the application of air distribution systems. Section headings are 1) Introduction, 2) Design objectives, 3) Air distribution principles, 4) Types of distribution equipment and systems, 5) Good design principles and practice, 6) Design evaluation for critical applications, 7) Evaluation of installed systems - site investigations. Supplies additional information in appendices.