Fume Hood Controls

A key component of the research laboratory is the fume hood. These devices have evolved over the years and can be purchased in an almost infinite number of configurations from the constant volume variety, to the state-of-the-art multiple combination sash style.

In a typical sequence, the sash on a fume hood is opened to allow access to the work surface inside. On a Phoenix Controls system, the sash movement generates a corresponding voltage command to the Phoenix Controls fume hood valve.
These pressure-independent air valves maintain proper flows over the entire range of command. The sash opening determines flow requirements through the hood while the room make-up air adjusts to maintain pressurization. If additional air is needed due to thermal or ventilation requirements, the general exhaust and make-up air valves adjust accordingly.

Phoenix offers a wide variety of sash sensors to accommodate all styles of fume hoods, and has several styles of fume hood monitors to provide continuous monitoring and different features for the various types of control (Constant volume, 2-position, VAV and UBC), along with meeting regulatory requirements and offering energy-saving features.

In addition to the flow requirements for fume hood laboratories, the exhaust airflow valve supporting the hood has its own set of requirements. It must be made out of materials, or coated with a material impervious to the fumes and/or gases being exhausted through it.