In Case your air high quality is bad and you also don’t have an air purifier, an HVAC filter taped to a box fan is much better than nothing. กิจกรรมเพื่อสาธารณะประโยชน์ของบริษัท Two Coway filters that we ordered in February 2021 experienced a slight odor, and filters that arrived new in 2022 Successfully Submitted (Awaiting Approval)