The controls required

D.7.2.4 The controls required in D.7.2.1 to D.7.2.3 shall be located outside the space concerned so
they will not be cut off in the event of fire in the space they serve.
D.7.2.5 Concerning control of smoke spread for machinery spaces, see D.7.3.3.
D.7.2.6 Automatic stopping of ventilation fans when releasing the CO2-System is not permitted. Separate
manual stopping of ventilation fans is to be carried out before releasing the CO2- System.
D.7.3 Control of smoke spread
D.7.3.1 Purpose
The purpose of this requirement is to control the spread of smoke in order to minimize the hazards from
smoke. For this purpose, means for controlling smoke in atriums, control stations, machinery spaces and
concealed spaces shall be provided.
D.7.3.2 Prevention of spread of smoke over several decks
Ventilation ducts serving more than one deck level shall be provided with readily accessible means of
closure at each deck level.
D.7.3.3 Release of smoke from machinery spaces
D.7.3.3.1 The provisions of D.7.3.3.2 to D.7.3.3.4 shall apply to machinery spaces of category A, and
where considered desirable to other machinery spaces.