The simplest way to describe a dry riser is an empty pipe installed vertically into a building to assist fire fighters when tackling a blaze in a building above 18m in height.
The dry riser will be equipped with a water inlet box situated on the outside of the building. This box houses the inlet valve to which the firefighters can connect their pressurised fire fighting appliances.
Once the source is attached, firefighters can enter the building and connect their houses at the landing valve located closest to the fire itself saving the need to carry houses throughout the building itself. This can speed up fire fighting, as well as remove any potentially hazardous houses from escape routes.