The American-Lights® UV Air Cleaner is professionally installed by a qualified contractor inside the air duct of heating, ventilation and air conditioning (HVAC) systems of home and offices and covers up to 5,000 square feet. By treating the air which passes through the HVAC system with ultraviolet light, you can effectively reduce or eliminate the DNA-based airborne contaminants - allergens, pathogens, toxins, asthma triggers - that cause allergy, asthma attacks, sickness and respiratory conditions.