Section R. 400.8370 - Light, ventilation, and screeningRule 370.
(1) The total ventilation area in every habitable room, as provided by openable windows, must be not less than 41/2% of the floor area, unless central air conditioning is provided.(2) If ventilation is dependent on a mechanical system, then the system must be on at all times while the building is occupied and shall comply with the ventilation requirements of the applicable mechanical code of the authority having jurisdiction.(3) Windows and doors used for ventilation must be supplied with screening of not less than 16 mesh, which must be kept in good repair. This subrule does not apply to child care programs operating in school buildings.Mich. Admin. Code R. 400.8370
2013 AACS; 2020 MR 23, Eff. 12/18/2019