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406.1 General.
Uninhabited spaces, such as crawl spaces and attics, shall be provided with natural ventilation openings as required by the New York City Building Code or shall be provided with a mechanical exhaust and supply air system. The mechanical exhaust rate shall be not less than 0.02 cfm per square foot (0.00001 m
3
/s • m
2
) of horizontal area and shall be automatically controlled to operate when the relative humidity in the space served exceeds 60 percent.
406.1.1 Methane and radon venting.
The design and materials used in the installation of the methane and radon vent systems shall be approved by the commissioner and shall comply with all applicable rules of the Fire Department.
407.1 General.
Mechanical ventilation for ambulatory care facilities (Group B) and Group I-2 occupancies shall be designed and installed in accordance with all applicable federal, state and local regulations.
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.
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