As Pointed out inside our guideline to leading-rated peaceful air purifiers, we endorse cross-checking claimed decibel degrees with buyer groups like Silent Mark, a UK-based mostly independent global certification software that identifies the quietest products and solutions. จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น Based on AHAM , your air purifier should have a CADR Successfully Submitted (Awaiting Approval)