Should Your air top quality is negative and you also don’t have an air purifier, an HVAC filter taped into a box supporter is a lot better than nothing at all. จัดส่งฟรี! เมื่อสั่งซื้อเครื่องกรองอากาศทุกรุ่น In line with AHAM , your air purifier should have a CADR score similar to about two-thirds Successfully Submitted (Awaiting Approval)