The internationally respected Nature Magazine published an article on 2nd Feb confirming that COVID19 can be transmitted through the air.
This therefore equally applies to air conditioning that circulates air through buildings. This is a position that we have taken from the outbreak of the pandemic, and have said that this was the case in the cruise ships.
We have had hotel quarantine guards 2 in Melbourne and 1 in Western Australia and a resident in hotel quarantine contract the virus seemingly through airborne transmission.
Finally the health authorities are waking up to this actuality.