Uninhabited spaces, such as crawl spaces and attics, shall be provided with natural ventilation openings as required by Chapter 12 of the Chicago 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.
(Amend Coun. J. 9-14-21, p. 35949, Art. IV, § 7)