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When modeling multiple zones on a single zone system, EnergyPro will “combine” the zones for the purposes of reducing the unmet load hours. Basically, the program puts all the zones onto a single thermostat. However, the CBECC simulation does not allow these zones to have multiple exhaust fans, and they must all be on the first zone.
At the Zone level of the Building Tree, you can put all of the exhaust fans into a combined exhaust fan on the first Zone listed under the HVAC System.
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