International Mechanical Code Section 405.1 is hereby amended to read as follows:

405.1 General. Mechanical ventilation systems shall be provided with manual or automatic controls that will operate such systems whenever the spaces are occupied. Air-conditioning systems that supply required ventilation air shall be provided with controls designed to automatically maintain the required outdoor air supply rate during occupancy. For additional mechanical system control requirements, refer to the 2018 International Energy Conservation Code Section C403.4, HVAC System Controls, as amended by the State of Washington.