Can an induction system comply with the building regulations for smoke control with central plant installations?
Yes. AS1668.1: 1998 nominates two methods for smoke control in buildings. These are purging and zone pressurisation, commonly referred to as sandwich pressurisation. Induction systems can perform in either design. All central plant systems have fire dampers in the supply air ducts where they leave the riser and enter the floor, as well as a fire damper in the return air opening into the riser system. If they are not the motorised type capable of remote control, a separate motorised shut-off damper will be adjacent and in positions that do not compromise the operation of the fire dampers. AS 1668.1 does not give a specific value for the supply or exhaust rates for either system Rather it describes the required method of operation to achieve the intended result of excluding smoke from all non-fire-affected compartments. It also deals with other possible building air handling systems such as car park exhaust, but this does not concern us here. For the zone pressurisation option in a build