8.—(1) A designated room in an offshore installation is not smoke-free.
(2) In this regulation a “designated room” means a room used only for smoking which—
(a)has been designated in writing by the person in charge of the installation in which the room is situated as being a room in which smoking is permitted;
(b)has a ceiling and, except for doors and windows, is completely enclosed on all sides by solid, floor-to-ceiling walls;
(c)does not have a ventilation system that ventilates into any other part of the premises (except any other designated rooms);
(d)does not have any door that opens onto smoke-free premises which is not mechanically closed immediately after use; and
(e)is clearly marked as a room in which smoking is permitted.