High efficiency air-con filter that is ideal for baby or asthmatic patients' rooms. Contains electrostatic charges with an anti-bacterial formulation (registered under US EPA). Retains dust, smoke, bacteria, viruses and airborne allergens. Inhibits the growth of fungi, mold and bacteria. Meets Underwriters Laboratories (UL) Class 1 flammability rating. Easy to install and replace. Effective for up to two months.