Book excerpt: IIn this book the reader can get an overview of different ventilation systems in simple and understandable terms. Complicated details of standards and regulations are not discussed, but the subject of ventilation systems should be made effortlessly accessible to an interested audience. The building owner must ultimately make the decision as to whether and which system should be installed in his building. The experience of the last 20 years shows that the client is usually only informed about one or two systems. The craftsman, architect or property developer often cannot provide more. This book is intended to help the client to make the right "ventilation decision". It shows a cross-section of different systems, with their advantages and disadvantages and offers a small insight into the variety of different manufacturers of ventilation systems.