And Two, it’s more sensitive to filter life than Another purifiers: We’ve measured pretty substantial fall-offs when tests year-aged filters. Blueair endorses changing the filter “every six months or so,” and it’s best to follow that agenda. กิจกรรมเพื่อสาธารณะประโยชน์ของบริษัท That third product ran at our Business for over two yrs straight Successfully Submitted (Awaiting Approval)