When modeling conditioned spaces under Title 24, all spaces are required to be ventilated per the code. At the Zone level of the tree, in the Mechanical tab, you have set the Ventilation to Natural Ventilation. The Natural Ventilation choice is only valid in the software for Hotel/Motel Guestrooms (2016 Title 24 also allows it in Highrise Res) and cannot be used for other occupancies. This setting needs to be change to either a Ducted HVAC System, or to an Exhaust Fan.
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