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(SECTION PM-706.0 ELEVATOR RECALL) PM-706.1 Required: All elevators having a travel distance of 25 feet (7620 mm) or more above or below the primary level of elevator access for emergency fire-fighting or rescue personnel shall conform to the requirements of the Safety Rules for Elevators and Escalators. (SECTION PM-707.0 MECHANICAL EQUIPMENT CONTROL) PM-707.1 Smoke and heat detection: Approved smoke or heat detectors shall be installed in return air ducts or plenums in each recirculating air system with a capacity of more than 2,000 erin (0.94 m3/sec) and serving more than one floor in buildings that exceed six (6) stories in height in accordance with the mechanical code adopted by the City of University City. Actuation of the detector shall stop the fan(s) automatically and shall be on the manual-reset type. Automatic fan shutdown is not required where the system is part of an approved smoke control system. (SECTION PM-708.0 SHAFT ENCLOSURES) PM-708.1 General: All floor openings connecting two or more stories shall be protected by shaft enclosures as required by Section PM-708.2. Exceptions: Floor openings exempted by the provisions of the building code adopted by the City of Uuiversity City. In buildings of Use Group B, stairs connecting not more than two stories with less than 3,500 square feet of floor area per story. In buildings of Use Group B, stairs connecting not more than three stories provided the building is equipped throughout with an approved automatic sprinkler system. In buildings of Use Group E and R-l, stairs connecting not more than two stories provided the building is equipped throughout with an approved automatic sprinkler system. In buildings of Use Groups F and S, stairs connecting not more than two stories. In buildings of Use Group F and S, stairs connecting not more than three stories provided the building is equipped throughout with an approved automatic fire suppression system. In buildings of Use Group M, stairs connecting not more than two stories with less than 2,000 square feet of floor area per story, or when connecting not more than two stories provided the building is equipped throughout with an approved automatic sprinkler system. In buildings of Use Group R-2, stairs connecting not more than two stories with not more than four dwelling units per story. 31