And Two, it’s much more sensitive to filter existence than some other purifiers: We’ve measured pretty important drop-offs when testing year-aged filters. Blueair endorses changing the filter “each and every 6 months or so,” and it’s best to keep on with that program. กิจกรรมเพื่อสาธารณะประโยชน์ของบริษัท CADR (clean up air delivery ranking) https://mannatureairpurifier.com/