ดักจับฝุ่น สารก่อภูมิแพ้ และแบคทีเรีย Adjustability: We Only picked air purifiers with not less than 3 adjustable velocity ranges. Air purifiers may be loud at their best velocity — having reduced, quieter speed possibilities, especially in bedrooms, is crucial, based on personal experience. We examined the Coway Airmega Icon purifier in April waiting for link from Social Network Posts (3)