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415.11.1.3 Location of occupied levels.
Occupied levels of fabrication areas shall be located at or above the first story above grade plane.
415.11.1.4 Floors.
Except for surfacing, floors within fabrication areas shall be of noncombustible construction.
Openings through floors of fabrication areas are permitted to be unprotected where the interconnected levels are used solely for mechanical equipment directly related to such fabrication areas (see also Section 415.11.1.5).
Floors forming a part of an occupancy separation shall be liquid tight.
415.11.1.5 Shafts and openings through floors.
Elevator hoistways, vent shafts and other openings through floors shall be enclosed where required by Sections 712 and 713. Mechanical, duct and piping penetrations within a fabrication area shall not extend through more than two floors. The annular space around penetrations for cables, cable trays, tubing, piping, conduit or ducts shall be sealed at the floor level to restrict the movement of air. The fabrication area, including the areas through which the ductwork and piping extend, shall be considered a single conditioned environment.
415.11.1.6 Ventilation.
Mechanical exhaust ventilation at the rate of not less than 1 cubic foot per minute per square foot (0.0051 m
3
/(s · m
2
)) of floor area shall be provided throughout portions of the fabrication area where HPM are used or stored. The exhaust air duct system of one fabrication area shall not connect to another duct system outside that fabrication area within the building.
A ventilation system shall be provided to capture and exhaust fumes and vapors at workstations.
Two or more operations at a workstation shall not be connected to the same exhaust system where either one or the combination of the substances removed could constitute a fire, explosion or hazardous chemical reaction within the exhaust duct system.
Fire dampers shall not be installed in exhaust ducts.
415.11.1.7 Transporting hazardous production materials to fabrication areas.
HPM shall be transported to fabrication areas through enclosed piping or tubing systems that comply with Section 415.11.6, through service corridors complying with Section 415.11.3, or in exit access corridors as permitted in the exception to Section 415.11.2. The handling or transporting of HPM within service corridors shall comply with the New York City Fire Code.
415.11.1.8 Electrical.
Electrical equipment and devices within the fabrication area shall comply with the New York City Electrical Code. The requirements for hazardous locations need not be applied where the average air change is at least four times that set forth in Section 415.11.1.6 and where the number of air changes at any location is not less than three times that required by Section 415.11.1.6. The use of recirculated air shall be permitted.
415.11.1.8.1 Workstations.
Workstations shall not be energized without adequate exhaust ventilation. See Section 415.11.1.6 for workstation exhaust ventilation requirements.
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