จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น Adjustability: We Only picked air purifiers with at least a few adjustable pace levels. Air purifiers may be loud at their highest pace — getting lower, quieter velocity selections, especially in bedrooms, is very important, determined by private encounter. The GermGuardian AC4825 has been around For several years Successfully Submitted (Awaiting Approval)