We got a HEPA filter for my spouse’s office & my kid’s classroom, both are home for the summer, and we already had two, so…we now have •four• HEPA filters going full blast in the house. My particle counter says they’re reducing ≤0.5µm airborne particles vs outdoors by a factor of 14. I mean…14x! We’re very fortunate! But I like being outside in the summer. Also, it’s really loud in here.