เครื่องถูกปิดผนึกอย่างแน่นหนาเพื่อกักเก็บสารมลพิษเอาไว้ Adjustability: We Only picked air purifiers with at least a few adjustable velocity amounts. Air purifiers is usually loud at their greatest velocity — acquiring reduce, quieter speed choices, especially in bedrooms, is important, dependant on individual encounter. Two Coway filters that we procured in February 2021 had a Successfully Submitted (Awaiting Approval)