#physics **UVC and Covid** I'm surprised that the medical power group is still going for hepa filters when this is the way to go. I think their filter views are an extension of masks, which are generally useless.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956276/

I've the UVC/titania filters in the house. They give a fresh outdoor feeling and may be the answer to indoor air problems, especially that 'dead air' feeling.