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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

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