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All habitable rooms (i.e. rooms for living, sleeping, eating or cooking) shall be provided with natural light by means of exterior glazed openings with an area not less than 1/10 of the floor area of such rooms with a minimum of 10 square feet.
A minimum duration of 3 hours should be used for emergency escape lighting if the premises are not evacuated immediately, as in the case of sleeping accommodation, for example, or if the premises will be reoccupied immediately the supply is restored without waiting for the batteries to be recharged. minimum duration of 3 hours should be used for emergency escape lighting if the premises are not evacuated immediately, as in the case of sleeping accommodation, for example, or if the premises will be reoccupied immediately the supply is restored without waiting for the batteries to be recharged.