Designing comfortable internal conditions in buildings is essential in guaranteeing occupants' good health, wellbeing and high productivity. This is of particular importance as leading firms are emphasising the shift from product delivery towards the satisfaction of clients' and users' needs by unlocking the potential of facilities management integration within the design processes of new or refurbished projects. It is therefore paramount that FM professionals keep in touch with current thinking and best practices to realign themselves with this notion of FM integration and the shift towards service provision. The papers included in this e-book were selected from the Indoor Air 2005 conference to raise the implications of indoor air quality requirement and regulations on the facilities profession. This e-book aims to assist facilities management in increasing the productivity of their assets by providing a comfortable and healthy internal environment for users with low environmental and financial costs.