Effective ventilation strategies demand flexible system design.

User experiences of the workings of a ventilation system have often been pretty disheartening. Draughty, too hot, noisy, too stuffy are some of the verdicts which in many cases have been confirmed by objective measurements. Often the complaints are due to the air flows not being appropriate to the room. This in turn can be due to adjustment difficulties or to the flow balance in different branches of the system being affected by residents tampering with the supply or exhaust air terminal device settings. In order to avoid these problems Stifab has developed a product - a self-acting pressure regulatorwhich makes it possible to design more flexible systems. The pressure regulator makes it possible for a constant pressure to be maintained in the different branches of the ventilating system. This is practically independent of changes or influences elsewhere in the system. To guarantee perfect performance throughout the usehl life of the ventilating system, the regulators are stationed at appropriate points in the distribution system. The paper describes examples of different system design in order to get: 1. a flexible demand controlled ventilating system 2. guaranteed air flow balance between supply and exhaust