Hi,
This is kind of technical as it deals with fluid movement. I'd like hear what experts has to say. The problem is this:
Suppose one lived in a city with poor air quality, in a high rise condo that one can modify or install anything, and cost is not a factor. The goal is to ensure the cleanest air possible in the unit at all times.
One can place multiple air purifiers in the unit. Those air purifiers sucks in air via a fan and force the air through a filter (say, HEPA), and eject the filtered air out. If the unit is large, I would assume one air filter might not be enough since it might only be able to clean the air in one area, and diffusion would be needed for all the air in the unit to eventually get cleaned. But this assumes the condo is a closed system with no air exchange with the outside. We need oxygen and air exchange with the outside.
One solution would be to completely seal the unit so that it is a closed system except for an air intake and exhaust that can be controlled. All the intake air would go through a filter. But this is a bit risky if the system breaks down there'd be no air/oxygen exchange with the outside. And if this happened while one is asleep, it is risky.
The simpler solution is to place multiple powerful air purifiers in different areas of the unit, while not closing the unit from the outside completely (say, the door gaps, or only closing the windows 99% of the way). This way, natural wind and diffusion wouldn't introduce much dirty air into the unit (the rate will be slow) so the unit would be semi-closed off. But the small openings would still allow outside air to be drawn in via the indoor air purifiers (they have fans after all). And as long as there are multiple air purifiers working all the time, this should still result in indoor air orders of magnitude cleaner than the outside right? Because the rate at which the air gets "cleaned" by the air purifiers will be higher than the rate at which dirty air gets introduced via those small gaps. But I would assume there would still be an equilibrium level of pollutants in the indoor air.
The goal is to achieve at least 95% reduction in air pollutants.
Someone who is more well versed in this area please provide some suggestions or comments on whether that's achievable.
Thanks