I would like to find out how do you set up toilets in Trace. I have office building where small toilets are only served by extract fan. Grill in door will provide make up air. I can think about few options:

1) make CAV system for WC, at the end air will have to be supply somewhere I just providing air directly in Toilet room

2) set up in template ventilation rate =0 and just type room exhaust = however,not sure if that is OK as unbalanced

3) In room-Airflow select toilets and at the top chose adjusted air transfer from room, in that scenario I will also just type Room exhaust value and ventilation will be left as 0, system probable will chose heating only

Can anyone tell me bet way of doing it?