1、Energy Efficient Design: The nonwoven fabric in this kit features upgraded electrostatic electret filtration technology for energy efficiency and longer life to ensure maximum filtration effectiveness. 2、Low Density Construction: Low wind resistance, higher efficiency and less pressure with manufacturer proven advanced low energy and low density construction technology. 3、For A Healthy Environment: Extend the life of your filters. This accessory is the right choice for you. Create a healthy and comfortable environment for those who want to breathe great gas and meet your daily needs. 4、Remove Unpleasant Odors: Filter replacement helps you get 99.7% of suspended matter such as hair, dander, and lint to improve gas quality. And activated carbon filters allow you to remove unpleasant odors. 5、Wide Application: This kit is designed for HPA300, HPA200, HPA100 series, including for HPA300, HPA300VP, HPA304, HPA3300, HPA5300, HPA8350, HPA200, HPA201, HA202, HPA204, HPA250, HPA090 , HPA094, HPA100, HPA101, HPA104, HPA105, HA106, etc. 3 x Filter Screen4 x Filter Cotton Item Type: Air Purifier Filter KitMaterial: PP, PETApplication: Compatible for HPA300, HPA304, HPA8350, HPA300VPPart Number: HRF R3