เครื่องถูกปิดผนึกอย่างแน่นหนาเพื่อกักเก็บสารมลพิษเอาไว้ Adjustability: We Only picked air purifiers with at least three adjustable speed stages. Air purifiers might be loud at their greatest velocity — obtaining reduce, quieter velocity selections, especially in bedrooms, is very important, based upon individual working experience. The GermGuardian AC4825 has been around For a long time Successfully Submitted (Awaiting Approval)