Conventional pneumatic and electric control employs subsystems and components that traditionally operate without the coordination and sharing of information available with DDC systems. DDC systems integrate subsystems and components to work together, to share information, and to maximize energy efficiency of the environmental conditioning system. This integration of subsystems maximizes energy efficiency by reducing energy-wasting operating times and conflicting zone conditioning requirements. An integrated laboratory system also allows fume hood use and laboratory conditions to be monitored remotely or historically with the data compiled by the DDC system. Monitoring fume hood use helps indicate where and when energy is being wasted. [Mayhew, 1993; Barker et al., 1993]
