Duogreen is a registered trademark of iOttie, and it strive to provide the customers with the top quality products at all times. Duogreen undergoes series of rigorous screening processes of all its products through continuous testing and sampling to maintain its top notch manufacturing process. Duogreen"s current products ranges from DLP lamps, Irobot accessories and many more.Duogreen"s replacement HEPA filter for Dyson DC14 All-Floors Cyclone Upright Vacuum Cleaner filter Part No. 901420-02 are durable, reduces the amount of dust, pollen and other allergen infiltration and are approved for allergy sufferers . Filters should be washed at least once every six months. Sometimes "Less is More!!"