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702.7 Dead-end travel distance. All corridors that serve more than one exit shall provide direct connection to such exits. The length of a dead-end corridor shall not exceed 35 feet (10,668 mm) where the building is not equipped throughout with an automatic sprinkler system. The dead-end travel distance limitation shall be increased to 70 feet (21,336 mm) where the building is equipped throughout with an automatic sprinkler system. 702.8 Aisles. Arrangements of chairs or tables and chairs shall provide for ready access by aisle access ways and aisles to each egress door. The minimum clear width of each aisle in occupancies in Use Groups A, E and 1-2 shall be maintained in accordance with the requirements of the Building Code of University City. In all other occupancies, aisles shall have a minimum required clear width of 44 inches (1118 mm) where serving an occupant load greater than 50, and 36 inches (914 mm) where serving an occupant load of 50 or less. The clear width of aisles shall not be obstructed by chairs, tables or other objects. 702.10 Information signs. A sign shall be provided at each floor landing in all interior stairways more than three stories above grade, designating the floor level above the floor of discharge. All elevator lobby call stations on all floor levels shall be identified by approved signs in accordance with the requirements for new buildings in the Building Code of University City. Exception: The emergency sign shall not be required for elevators that are part of an accessible means of egress complying with the Building Code of University City. 702.11 Locked doors. All means of egress doors shall be readily openable from the side from which egress is to be made without the need for keys, special knowledge or effort, except as provided for in Section 702.11.1 702.11.1 Locks permitted. Locks or fasteners shall not be installed on egress doors except in accordance with the following conditions: 1. In mental, penal or other institutions where security of inmates is necessary provided approved provisions are made to remove occupants in case of fire or other emergency utilizing properly trained supervisory personnel who are continuously on duty. 2. In problem security areas provided approved provisions are made for special purpose door alarms or locking devices. Manually operated edge or surface mounted bolts are prohibited. 3. Key operation is permitted from a dwelling unit provided the existing dwelling unit means of egress door contains a glass panel or is located immediately adjacent to an existing window or fixed glass panel and there is another approved means of egress door from the dwelling unit not requiring key operation from the inside. 702.12 Emergency escape. Every sleeping room located in a basement shall have at least one openable window or exterior door approved for emergency egress or rescue; or shall have access to not less than two approved independent exits. Where a window is provided for emergency egress or rescue, the window shall have the bottom of the clear opening not more than 44 inches (1118 mm) above the floor. The minimum net clear opening shall be 5 square feet (0.47 m2). The minimum net clear opening height dimension shall be 24 inches (610 mm). The minimum net clear opening width dimension shall be 20 inches (508 mm). 27