Trace 700 ERU Dual wheel

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Trying to model a Dual Wheel ERU in a DOAS, when I choose a solid desiccant wheel I can't select the ventilation downstream. This is an HVAC system for a museum, so the dehumidification is important. Wondering if there are any systems similar to a solid desiccant wheel that can simulate the needs, or a configuration to allow the supply side deck to go downstream.