We examination new and old machines. When retesting our current air-purifier picks, we consider 4 measurements—two utilizing the old filters and two using new filters—to learn the way (or even when) their effectiveness changed with time. ❌ You'd like a pretty air purifier: The design with the Winix 5500-2 is https://growthbookmarks.com/story16910700/air-purifier-no-filter-needed-secrets