Australia: Brisbane outbreak,most likely Airborne

ABC News: Experts call on Federal Government to acknowledge possible airborne transmission of COVID-19 in hotel quarantine.

https://www.abc.net.au/news/2021-01-16/hotel-quarantine-gap-prevent-airborne-spread-of-covid-19/13057644

It was droplet and not airborne

now people need Duckbill Virus masks and not ordinary surgical masks

https://products.halyardhealth.com/infection-prevention/facial-respiratory-protection/masks-respirators/halyard-duckbill-surgical-mask.html

Droplet transmission is infection spread through exposure to virus-containing respiratory droplets (i.e., larger and smaller droplets and particles) exhaled by an infectious person. Transmission is most likely to occur when someone is close to the infectious person, generally within about 6 feet. 

Airborne transmission is defined as the spread of an infectious agent caused by the dissemination of droplet nuclei (aerosols) that remain infectious when suspended in air over long distances and time.

yeah sure

but going through the air conditioner from room to room infecting people?

The line between "droplet infection" and "airborne infection" is not a hard and fast one.  It is a bit fuzzy.  

The classification of airborne is generally applied to bugs which can survive outside the body long enough to travel in wafted air.  Enveloped viruses like coronavirus fit this bill perfectly.  Air conditioning will do that very well indeed for all of them.  A more rigid classification of airborne is sometimes applied to those bugs, and only those bugs, which come from the upper respiratory tract, and therefore travel further in human breath.  This does not apply to covid19 which is a lower respiratory tract infection.  

Better quality masks DO provide better protection for the wearer.  That does not mean that even a cheap bit of scarf does not make a big difference, nor that ANY mask provides complete protection.  However it is bad practice generally to let the quest for the perfect get in the way of use of the good.

Finally, mask wearing is a public health measure.  If everyone wore masks religiously, the spread would be limited.  Each person would get a small amount of protection from their own mask and a great deal from their neighbours'.