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514.5 Combined system allowed.
Environmental exhaust air and toilet exhaust may be combined in any occupancy downstream of all air inlets of the system provided that such exhaust cannot be recirculated. In Group R occupancies, exhaust from domestic kitchens and toilets/baths from one or more dwelling or sleeping units may be combined at a point downstream of all air inlets of the system.
Section MC 515: Postfire Smoke Purge Systems
515.1 General.
Postfire smoke purge systems shall be provided as required by Chapter 9 of the New York City Building Code.
Chapter 6: Duct Systems
Section MC 601: General
601.1 Scope.
Duct systems used for the movement of air in air-conditioning, heating, ventilating and exhaust systems shall conform to the provisions of this chapter except as otherwise specified in Chapters 5 and 7.
   Exception: Ducts discharging combustible material directly into any combustion chamber shall conform to the requirements of NFPA 82.

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