Oh, I agree with respect to the confusion! It would be great to know what they use, EXCEPT hospitals use very large, integrated whole building air management systems, plus in some cases supplemental systems in specific areas. None of these is available to the consumer at a size that would work in a home.

You will need to do some homework to find the best systems for home use. In addition, you need to be concerned about both ventilation (air exchange) and air purification (via filter, UV light or another technology.) The best place to start would be with an agency that certifies systems. Also, one word of caution - some air purifiers emit ozone, which you do not want in your home or office, so make sure any unit you select does not.

We have a whole house ventilation system, a whole house HEPA filtration system, and run portable units in our main living spaces. I will not recommend anything by brand name here - whenever someone in our family is in the market, we simply look for the best-rated HEPA unit currently available. Remember that to remain effective, filters need to be changed frequently.

Sue