And Two, it’s far more delicate to filter life than Several other purifiers: We’ve calculated pretty major fall-offs when testing 12 months-aged filters. Blueair suggests changing the filter “each 6 months or so,” and it’s best to stick with that routine. กิจกรรมเพื่อสาธารณะประโยชน์ของบริษัท Together with a HEPA filter, the Air Professional waiting for link from Social Network Posts (41)