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You have selected an HVAC system that is a multiple zone Variable Air Volume (VAV) system. This type of system requires that you input the Zone Terminal Boxes for each zone served by the system. If a zone does not have any terminal boxes, simply input a terminal box that is Constant Volume for the modeling.
To input the terminal box, go to the Zone level of the Building Tree, in the Mechanical tab you will select an appropriate Zonal System for the zone.
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