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408.1 General.
Non-production chemical laboratories complying with the hazardous materials quantity limitations of Section 427 of the New York City Building Code shall provide a mechanical ventilation system in accordance with NFPA 45 and Table 403.3.1.1 of this code, except that ducts constructed of combustible materials shall not be permitted.
Chapter 5: Exhaust Systems
Section MC 501: General
501.1 Scope.
This chapter shall govern the design, construction and installation of mechanical exhaust systems, including exhaust systems serving clothes dryers and cooking appliances; hazardous exhaust systems; dust, stock and refuse conveyor systems; subslab soil exhaust systems; smoke control systems; energy recovery ventilation systems; and other systems specified in Section 502.
501.2 Independent system required.
Single or combined mechanical exhaust systems for environmental air shall be independent of all other exhaust systems except as permitted in Section 514. Dryer exhaust shall be independent of all other systems. Type I exhaust systems shall be independent of all other exhaust systems except as provided in Section 506.3.5. Single or combined Type II exhaust systems for food-processing operations shall be independent of all other exhaust systems. Kitchen exhaust systems shall be constructed in accordance with Section 505 for domestic equipment and Sections 506 through 509 for commercial equipment.

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