This article will explain how to use Environexus where you have a ducted fan shared between multiple rooms.
In most instances, the fan is required to switch on when the light switches on but this solution will also work with separate switches for the fan and the light.
These systems are traditionally deployed with a double pole switch in each room that ensures the common fan is on no matter which room turned on the light.
In this example we are using a bathroom and laundry, there is also a hard active for the fan which keeps the fan running for 8 minutes when both fan switch locations turn off.
If there is no need for an all-off scene then the NERO-RELAY for the laundry area can generally be omitted. If you do include this relay ensure that you consider the case that someone may wish to put on a load of laundry before leaving their apartment so the fan should stay on even if everything else is turned off.
Combination A: Light and fan in each location
In the instance where there is a light and a fan in each room, 2x NERO-2RELAYs should be used and the below wiring diagram should be followed.
This will allow the light and fan to be switched together in both rooms, while also keeping the fan on if the fan is on in either room.
Combination B: Light and fan in one location, fan only in the other
This will allow the light and fan to be switched together in the bathroom, while also allowing the fan to controlled in the laundry
Notes for larger systems
For larger shared system you can continue the same wiring diagram out to additional locations, ensuring that the fan remains connected at each location as shown in the diagrams above. For example if you had two bathrooms, a laundry, and a toilet and each had a light you would need 4x NERO-2RELAY's and use O1 as the light output in each room and O2 as the shared connection to the fan across all 4 devices.