1.1 The purpose of the smoke control and ventilation
systems depends on the type of space being considered.
1.2 For internal assembly stations, the smoke
control and ventilation systems should be capable of preventing the
entry of smoke from surrounding spaces in order to permit the assembling
of passengers.
1.3 For atriums, the smoke control and ventilation
systems should be capable, in the spaces served by such systems, of
maintaining visibility in order to assist in safe escape and to allow
fire-fighters to operate.