Get $15 Discount On Mini Air Purifier At Bestbuy.com. Keep the air clean and healthy with this Therapure mini air purifier that is designed for areas up to 5 sq. ft. The Stainless-steel collection blades allow easy cleaning and ultraviolet light destroys airborne viruses. It is ideal for small areas, including closets, pantries and bathrooms. The ultraviolet light removes airborne viruses, germs and allergens.