We take a look at new and outdated machines. When retesting our current air-purifier picks, we get four measurements—two using the aged filters and two utilizing new filters—to learn how (or even though) their performance changed as time passes. Blueair’s HealthProtect 7470i has many of the technological bells and whistles https://socialbraintech.com/story2208383/not-known-facts-about-air-purifier-for-cough