Positive pressure from air purifiers and air conditioners supplying fresh air - Solution to keep rooms cleaner

Lately I've been learning about positive pressure as a way to clean rooms and keep rooms clean and find it very ideal. However, from a civil perspective, I don't see it deployed much in the places I go, or they deploy it without my knowledge. In this topic, I give the most basic information that I read and find logical. Hopefully those of you who work in the industry or have learned about this issue can discuss further.

What is positive pressure and how does it work?

When air purifiers or fresh air conditioners operate, they continuously suck air in from outside, filter out dirt, pollen, bacteria, VOCs... and then blow clean air into the room. The amount of air taken in is more than the amount of air released naturally (through doors, vents, exhaust fans...). As a result, the air pressure inside the room is higher than the pressure outside. For example, your wheels always have positive pressure compared to the outside environment. So when there is a hole, air will leak out from inside the wheel, but air from outside will not enter. If you maintain positive pressure in your room, the air or things in there will always come out, but things from outside cannot come in.

Actual benefits when used

How to create effective positive pressure

Conclusion: Positive pressure is not high technology

difficult to access but offers a solution that, at least in theory, is reasonable to help keep the room cleaner in addition to solutions such as air filtration, sterilization with ions or electric discharge to kill bacteria, UV rays... Those of you who are familiar with this matter, please explain further. I have mainly read the documentation but have not tested it in practice.