Is it possible to model an airloop with zones in series instead of in parallel in E+ - Revised

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I'm trying to model a mechanical ventilation system with heat recuperation in a two zone model.

The zones are connected in series (supply fan, zone splitter, air inlet in zone1, mixing object between zone1 and zone2, return node from zone2, zone mixer, extract fan.

The simulation runs without errors, but in the svg file I only see zone1, while i would like to see zone 2 connected in series.

Do I have to model the system in parallel and set the supply flow rate of zone2 and the return flow rate of zone1 to zero or is there an alternative? (is mixing visualized in the svg file?)

Revision:

Do I need a fictional exhaust fan in the system that I described above if I use zone mixing and put "Zone Air Mass Flow Conservation" to on (= to "yes")?

Actually the system looks exactly like this without the m'R1 and m'S2:

According to some other posts it is necessary, but when I do it the mass flow output from the exhaust fan seems to be 0 at every timestep. The flows are balanced:

Supply air mass flow rate in zone 1

= mixing source air mass flow rate in zone 1

= mixing receiving air mass flow rate in zone 2

= return air mass flow rate in zone 2.

I have the impression that I am missing something...