Circulate the Air Directly Down to Stop the Coronavirus

   Instead of air systems that send the virus particles upward, would it more often be better to suck the particles down?
   Virus particles are so small that even though you try to filter them out by wearing a mask, some surely must pass through. It seems a more sure way of keeping germs emitted from one person from being passing to another would be to whisk the germs away as soon as they exit the mouth or nose.
   Fans in the floor, that shoot the germs upward, taking them into the ceiling to be filtered out? There can be quite a distance to the ceiling, and some particles would wander to the right or left and then fall right back down. Better to have grates in the floor and fans that such the air down to the floor, where the virus particles can be filtered there.