Austin Air Replacement Filters for Junior Systems GENUINE: This is a genuine Austin Air air filter, accept no substitutes MEDICAL GRADE: Austin Air is the only manufacturer to have their products designated as medical grade air purifiers WARRANTY: As this is a brand new item it comes with an Austin Air warranty About Austin Air Filters Austin Air is an American company located in buffalo, New York that manufactures a high end air purifier. They are the only manufacturer to have their products designated as medical grade air purifiers. Austin is the only manufacture to successfully reduce asthma attacks and respiratory problems in a clinical Trial conducted by the medical community and recognized hospitals. Johns Hopkins Hospital has chosen their medical grade air purifiers to conduct four clinical trials. They were also selected by the federal Government to provide the emergency air purifiers to the citizens of Anniston, Alabama during the destruction of chemical weapons. Their constant research has kept them in close communication with respiratory experts and the medical community. They are frequently learning of new ways to help more diverse groups of people. Made in the U.S. and constant innovation and research keep them at the forefront of the air purifier industry.