An air filtration and sterilization system for removing airborne contaminants from air circulated through an air plenum system of a fireplace. Air filtration systems may include particulate, chemical, and ion filtration systems to filter the air. Air sterilization may include ultraviolet, ozone, germicidal...http://www.google.es/patents/US6736133?utm_source=gb-gplus-sharePatente US6736133 - Air filtration and sterilization system for a fireplace
Air filtration and sterilization system for a fireplace
