VENTILATION People are the customers and consumers of ventilation. Therefore, it is of great importance to plan the indoor environment with people in mind, and not just building surfaces and air. The focus must be on people as the final control point, not just the building itself. This position is necessary in order to develop healthy, realistic and sustainable indoor environments. In many companies today, the costs involving personnel are about 100 times higher than energy costs. It is therefore very uneconomical to save energy at the expense of people’s well-being.