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PM-702.8 Aisles: Arrangements of chairs or tables and chairs shall provide for ready access by aisle accessways 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 adopted by the City 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. PM-702.9 Stairways, handrail and guards: Every exterior and interior flight of stairs having more than four risers shall have a handrail on at least one side of the stairs, and every open portion ora stair, landing, balcony, porch, deck, ramp or other walking surface which is more than 30 inches (762 mm) above the floor or grade below shall have guards. Handrails shall not be less than 30 inches (762 mm) nor more than 42 inches (1067 mm) high, measured vertically above the nosing of the tread or above the finished floor of the landing or walldng surface. Guards shall be not less than 30 inches (762 mm) high above the floor of the landing, balcony, porch, deck, ramp or other walking surface. PM-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 adopted by the City 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 adopted by the City of University City. PM-702.11 Locked doors: All means of egress doors shall be readily openable fi.om the side fi.om which egress is to be made without the need for keys, special knowledge or effort, except as provided for in Section PM-702.11.1 PM-702.11.1 Locks permitted: Locks or fasteners shall not be installed on egress doors except in accordance with the following conditions: 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. 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. 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 27