If Your air high quality is negative and also you don’t have an air purifier, an HVAC filter taped to some box fan is much better than nothing. Uncompromised particle elimination Blueair DualProtection filters are actually designed for the last word particle, gasoline and odor elimination. ช่วยฆ่าเชื้อโรค กำจัดฝุ่น และกำจัดสารก่อภูมิแพ้ได้ในเครื่องเดียว At Successfully Submitted (Awaiting Approval)