Usual ventilation systems may be acceptable as arrangements for permitting the release of smoke required by regulations II-2/11.2.2 and 11.4.2.
This paragraph should also apply to lubricating oil service pumps, thermal oil circulating pumps and oil separators (purifiers) except oily water separators.
In machinery spaces of category A, controls to close off ventilation ducts and pipes should be installed with due regard to the hot gases produced by a fire in the space concerned.