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I L1 1204-1205 Exit Facilities UNIFORM BUILDING CODE Sec. 1204. Stairs, exits and smokeproof enclosures shall he as specified in Chapter 33. Every sleeping room below the fourth story shall have at least one operable window or exterior door approved far emergency escape or rescue. The units shall be operable from the inside to provide a full clear opening without the use of separate talc. All escape or rescue windows from sleeping rooms shall have a minimum net clear opening of 5.7 square feet. The minimum net clear opening height dimil- sion shall be 24 inches. The minimum net clear opening width dimension shall be 20 ii;ches, Where windows are provided as a means of escape or rescue they shall have a finished sill height not more than 44 inches above the floor. Bars, grilles, grates or similar dcvic 5 may be installed on an erergency escape or rescue windows or doors, provided: a r l . Such devices are equipped with approved release mechanisms which are openable from the inside without the use of a key or special knowledge or effort, and } 2. The building is equipped with smoke detcct(,-s installed in accordance with Section 1 2 10. Light. Ventilation and Sanitation Sec. 1205. (a) Light and Ventilation. All guest rooms, dormit,,nes and habitable rooms within a dwelling unit shall be provided with natural light by nxans of exterior glazed openings with an area not less than one tenth of the floor area of such rckwns with a minimum of 10 square feet. All bathrooms, watercloset compartments, laundry r(x)ms and similar rooms shall be provided with natural ventilation by means of openable exterior openings with an area nt-H less than one twentieth of the floor area of such rooms with a minimum of Isquare feet. All guest rooms, dormitories and habitable nA.,ms wit:..n a dwelling unit shall be provided with natural ventilation by means of openable exterior openings with an area of not less than one twentieth of the floof area of such rooms with a minimum of S square feet. In lieu of required exterior openings for natcial ventilation, a mechanical ventilating system may be pro,vtded. Such system shall be capable of providing two air changes per hour in all guest roc ,ms, dormitories, habitable rooms and to public corndon. One fifth of the an :.apply shall be taken from the outside. to bathrooms, water closet cmnpartments, laundry rooms and similar rrx.)ms a mechanical venttlatxxt system connected directly to the outside, capable of pmv,ding five air changes per hour, shall be provided. Rw the pugxmc of determining light and ventilation requirements, any mom may be consklemd as a portion of an adjoining room when one half of the area of ON 0"Tumm wall is open and unobstructed and provides an opening of ncct less than one tenth of the floor r ca of the interior r(xnn or 25 square feet, whichever is greater 12 Required exterwr openings fot natural light and ventilation shall open directly