New York City · Through Local Law 2026/135 (enacted August 31, 2026)

N.Y.C. Admin. Code § MC 406: Section MC 406: Ventilation of Uninhabited Spaces

Where this section sits in the code

New York City Administrative Code
Title 28
Chapter 8: New York City Mechanical Code

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

/s • m

) 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.

Collected 2026-09-06T02:48:57Z. Source file · JSON

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