Yes, completely true - if you had a home with positive pressure and a filtered HRV/ERV with sufficient volume, one wouldn't need internal air purifiers at all.

Yes, completely true - if you had a home with positive pressure and a filtered HRV/ERV with sufficient volume, one wouldn't need internal air purifiers at all. I've long wished for "smart" inwards-blowing window fans that took filters and conditionally only turned on when the air outside was an appropriate temperature - wouldn't be appropriate in all climates/seasons/times, but in my geography would pump clean air in into the house for months out of the year. https://naturescoolingsolutions.com/ecobreeze-2-1-smart-window-fan/ https://naturescoolingsolutions.com/ecobreeze-2-1-smart-wind... exists, but is pricey and isn't from a major-enough manufacturer to make me confident of after-sales support.