Mr. Declan Burke:

The vent stack is essentially a pipe. It is located within a metre or less of the district regulating station to minimise disruption to the surrounding area or ground. What I mean by that is the unnecessary opening of footpaths, etc. The vent stack is located as close as possible to the station but it is more about safety at a height level. It is at 2.5 m so it can be right beside the unit. It is more about physically undertaking the works to position it and secure it to the ground. It is then about the height, which is a minimum of 2.5 m. In the event it was to vent gas outside normal operating conditions, since gas is lighter than air it disperses to the atmosphere.