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[EnergyPlus_Support] Air flow from one zone to another: extraction to return air duct

Could anyone help me implement the following ventilation concept:

Say the building has 3 zones: treated air (SingleDuct:VAV:Reheat) is 
injected in the first zone. The same air flow rate passes from the 
first, through the second and into the third zone.

There is no treated air injected in the second or the third zone.

An air flow rate equal to the injection rate in zone 1 is extracted 
from zone 3.

Normally, one would suggest to supply air to zone 1 and to use a 
Fan:ZoneExhaust to balance air flows. Using ZoneMixing, you can 
simulate air flowing from zone 1 to zone 2, and air flowing from zone 
2 to zone 3.

However (now comes the hard part): the building has other VAV-balanced 
zones, and I want to add the extracted air from zone 3 to the return 
duct of the other zones because the return air is used in a heat-
exchanger.

So for zone 3, I have an air flow entering the zone because of the 
ZoneMixing (zone 2 as source zone), but how can I add the replaced 
zone air to the air in the return duct? 

I looked at the manual and at previous topics here, but I only found 
that ZoneMixing adds air to a zone, while supposing an equal flow rate 
has left the zone (without knowing where the air went)..

I would really appreciate your help! 



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