From the Queen's University Live Building site:
The [Biowall] is hooked into the buildingâ€™s HVAC control system
and fans pull air through the wall into the office spaces depending
upon the humidity and temperature in the rooms. Even when the fans
arenâ€™t running, air still moves slowly through the wall.
Both useful and decorative. Nice. Lots more information about how the mechanism works at the link.