16 CONTROLS

Controls form an integral part of the system design.
16.1 A smoke extract system is operated by an automatic
control system, which may be activated by any of the
following:
Smoke detection; heat detection; sprinkler flow
switch; manual alarm.

The preferred system is activation by zoned smoke
detection.
16.2 Ventilators operated only by a fusible link/thermal
device do not constitute a smoke extract "system".
16.3Power system controls and their connections should
maintain their integrity under design conditions in
a fire and should be designed to "fail" in the "on"
position.
16.4 Zone Control - The time taken for all ventilators
within a fire compartment to be fully operational
must not exceed 60 seconds from system
activation/smoke detection.
16.5 For natural ventilators used for life safety
purposes, in the event of power/system failure, the
equipment must failsafe in the "open" position.