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AirflowNetwork objects will not help with this. Simply(?) connect the regen fan inlet to a Zone Exhaust Node in the adjacent zone. Taking the DesiccantCVRhZoneRHCtrl.idf example file, I connected the "Regen Air Inlet Node" to Zone3, NORTH ZONE:

ZoneHVAC:EquipmentConnections,
NORTH ZONE,              !- Zone Name
Zone3Equipment,          !- Zone Conditioning Equipment List Name
Zone3Inlets,             !- Zone Air Inlet Node or NodeList Name
Regen Air Inlet Node,     !- Zone Air Exhaust Node or NodeList Name
Zone 3 Node,             !- Zone Air Node Name
Zone 3 Outlet Node;      !- Zone Return Air Node or NodeList Name

Fan:VariableVolume,
Desiccant Regen Fan,     !- Name
<snip>
Regen Air Inlet Node,!- Air Inlet Node Name
Regen Coil Inlet Node;   !- Air Outlet Node Name

Dehumidifier:Desiccant:NoFans,
Desiccant 1,             !- Name
<snip>
Regen Coil Out Node,     !- Regeneration Air Inlet Node Name
Regen Air Inlet Node,!- Regeneration Fan Inlet Node Name

Now, if the adjacent zone does not have any HVAC connected to it, you will be required to add something so that you can connect the exhaust node from that zone. If necessary, add a simple baseboard electric heater and schedule it off all the time.