Most of us have seen the graph explaining the arrangement of customers in a restaurant in Guangzhou, China, and how two people infected with covid-19 transmitted the coronavirus to other people in the same room; but not to all, but exactly to those who were sitting in the positions that coincided with the internal currents that the air conditioning created in the room.

The position of the WHO, as has been the case with everything related to the current pandemic that the world has been suffering for the last few weeks, is not clear and is limited to advising that precautions be taken. But anyone can come to the conclusion that the droplets of an infected person can reasonably find in the air conditioning currents a perfect ally to move in search of new organisms to contaminate.
That is why it is not superfluous to take a series of measures: Opting for direct ventilation in front of the air conditioning whenever possible in places with a large number of people, keeping the air conditioning units clean (ducts and filters), in the car or in public vehicles, opting for cooling modes that renew the air from the outside and that do not feed back, as the latter would cause greater options for contamination.