re: Coronavirus Disease 2019 (COVID-19) ***W.H.O. DECLARES A GLOBAL PANDEMIC***

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How did it get into the air system?

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It’s endemic in nature. Literally no way to know how. It could be as simple as someone setting a tool in the dirt outside and then touching the drip basin inside. It certainly wasn’t a cough droplet getting sucked in and condensing on the coils though.

The point that using a disease without as far as I know a single demonstrated person to person infection is a very bad example of “recirculating air” dangers. I can be in a plane full of overtly symptomatic individuals with it for six hours and I wouldn’t get infected.


You get infected by a contaminated water source (drip basin, cooling towers pools, tap water) getting heavily aersolized and breathing in the mist.

Drinking it doesn’t do it.

As a result, modern AC system take measures to not allowing that to happen, either by design or water treatment.