For multiple reasons the Alen air purifiers are regarded as the best air purifiers. Not only are the Alen air purifiers affordable, but Alen air purifiers have the most effective filtration; HEPA. Alen air purifiers have been proven to eliminate up to 99.42% of airborne particles. Alen air purifiers come in five different air purifier models; the T100 Alen air purifier is the best air purifier for small spaces like an office, the T300 Alen air purifier is the best air purifier for bedrooms, while the Paralda Alen air purifier is the best air purifier for a stylish room up to 400 sq. ft., the A350 Alen air purifier is the best air purifier for family rooms and the A375UV Multi Gas Alen air purifier is the best air purifier for those with extreme airborne sensitivities. Alen air purifiers feature a unique multi-filtration technology; combining the benefits of a HEPA air purifier with the benefits of an ionizer air purifier (all Alen air purifiers are ozone safe.) Alen air purifiers come with a lifetime warranty.