VESDA (an abbreviation of Very Early Smoke Detection Apparatus) is a laser based smoke detection system. The VESDA/ASD detection pipework systems will be installed to monitor at strategic points within the data centre. Typically, detection pipes will be positioned to either monitor the cold air discharge or the return air path or both air paths of the data centre air conditioning system. The VESDA will generally provide a signal for advanced warning purposes and are not be configured to discharge the fire extinguishant gas.