As building airflow control systems become more complex, their maintenance costs rise. Phoenix Controls delivers the value of an energy efficient critical room control system that requires virtually no maintenance for the entire life of the building. For example in Hospital;
Hospital operating rooms require reliable and accurate pressurization to ensure the room is continuously protected from potentially infectious airborne particles settling on sterile surfaces. Operating rooms are also high consumers of energy because they require high air-changes-per-hour so clean supply air can protect the surgical theatre and exhaust air can quickly sweep particles away from the patient. In the demonstration, two ventilation systems are compared; supply and exhaust VAV terminal boxes, and supply and exhaust Theris valves. The results clearly show Theris performs better than VAV terminal boxes for both energy savings and reliable pressure control.

Isolation rooms are designed for either airborne infectious isolation (AII – negative pressure) or protective environment (PE – positive pressure). In the demonstration, an AII room is configured with an anteroom, showing Theris tracking pairs of supply and exhaust valves through transparent ceiling tiles. High air-change-rate and reliable pressurization is demonstrated, including the features of a large-display advanced pressure monitor that shows true differential pressure references between the rooms