In a Multizone installation (scheme above) the VMX system manages and controls the ventilation flow rates in a decentralized manner, on the motorized valves.
Several valves and diffusers are connected to a single fan, which can serve one or several rooms. Generally there is one MAIN module per room.
The sensor(s) located in the room measure different parameters (CO2 concentration, presence, movement, etc.). They send signals to the modules which control the motorized valves (opening or closing of the shutters on a defined time) to adapt the air volume and improve the indoor air quality.