ABSTRACT
Before installing ducts for the entry of services into a building, it is essential to ascertain the location of pipes and cables provided by the public utilities companies. To accommodate horizontal services, a skirting or floor duct may be used. Vertical services may be housed in either a surface-type duct or a chase. Vertical ducts usually extend the full height of a building which is an important factor when considering the potential for spread. Services be installations to may be concealed services within the structure by an access board or panel. Panels are generally produced from wood particle board and have a galvanised steel casing or overwrap to enhance strength and provide fire resistance. The void between structural floor and raised panels will require fire stopping at specific intervals to retain the integrity of compartmentation. Reduction in fire resistance of the building elements penetrated.
