Question about virus spread in condos.

So a big number of us live in condos, and I was talking to a friend of mine who does AC and heating. And I asked him how does air circulate in condos. So basically all condos inside have negative pressure so if you open the door you can feel air coming in from the hall way inside you place.

My question is with this info, if someone sneeazes or coughs in front of your door, will those droplets be in your condo now. The won't travel to far but still.

Anyone think the same or have ideas on what to do to stop this.