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The regulation then sets out four conditions that have to be met for the smoke-free status to be lifted. Those four conditions are, first, that the room has a ceiling and, except for doors and windows, is completely enclosed on all sides by solid floor-to-ceiling walls. Secondly, it should not have a ventilation system that ventilates into any smoke-free premises. Thirdly, it must not have any door that opens onto any smoke-free premises that is not mechanically closed immediately after use. The fourth and final condition is that it is clearly marked as premises in which smoking is permitted.