As Noted inside our manual to leading-rated quiet air purifiers, we recommend cross-checking claimed decibel ranges with customer teams like Quiet Mark, a UK-based unbiased international certification system that identifies the quietest merchandise. จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น The Blue Pure 211+ aced our tests, and because it may possibly transfer really substantial Successfully Submitted (Awaiting Approval)