A variable air volume system working in conjunction with Phoenix valves were designed for a safest and efficient ventilation of the laboratories. Fume hood sash position sensors were provided to control constant face velocity with additional presence and motion sensors to command the laboratory airflow control system from an 'in use' face velocity of 100FPM to a standby face velocity of 60FPM and vice versa A fume hood monitor receives the signals and generates a control output for the proper airflow controls.
The airflow control devices are Phoenix valves, venturi type pressure independent valves that respond with in one second to maintain specific airflow and room pressurization. Phoenix valves are installed in the supply air and in the exhaust air.

The following objectives were achieved by the airflow control system:

	Maintain a constant average face velocity at each fume hood opening .
	Maintain a net negative laboratory room pressurization
	Provide minimum lab ventilation during off hours
	Provide space temperature controls
	Integration with the building management system (BMS)