Building Management Systems (BMS) are comprised of intelligent controllers and other input/output devices, which are networked together to provide comprehensive control and energy management over Heating, Ventilation and Air Conditioning systems (HVAC), as well as control over lighting schemes, to name jus a few examples. The input signals are then processed within the intelligent controllers, which then issue appropriate commands to the output devices such as valves, actuators or other output modules: Gloucester Building Controls can supply systems from a number of recognised manufacturers, such as Trend, York, Honewell, Siemens & Priva.