We have been recommending and using the EnviroKlenz Mobile Air System now for almost a year now and am pleased with the quality, affordability, and technology of the unit. My clients have been pleased as well and it is accomplishing what we all want, clean air but with a quiet system that is easily movable to where its needed and ease of use changing filters. When I teach clients about the problems with indoor air, closed windows, and quality they are excited to know a way to solve these issues especially with client that have multiple chemical sensitivities and environmental allergies.