(1) The occupier of a prescribed building or a place of open-air public entertainment must ensure that each of its required exits is kept clear at all times.Penalty: Fine not exceeding 50 penalty units and, in the case of a continuing offence, a further fine not exceeding 1 penalty unit for each day during which the offence continues.(2) In any proceedings for an offence under subregulation (1) in respect of a prescribed building, it is a defence if the defendant establishes that, at the relevant time (a) lawful building works were being done in the prescribed building; and(b) those works were being done as expeditiously as practicable; and(c) the obstruction of the relevant exit was an unavoidable consequence of those works or had been approved by a building surveyor for the purposes of those works.(3) In this regulation clear , for an exit, means (a) clear of any obstruction or impediment to use as an exit in the event of a fire; and(b) free of unlawful locks or unlawful locking devices; and(c) clear of flammable material.