Item Type: Air Purifier Filter Kit Material: PP, PET Application: Compatible for HPA300, HPA304, HPA8350, HPA300VP Part Number: HRF R3 Package List 3 x Filter Screen 4 x Filter Cotton We recommend that you change the filter every 612 months and the pre filter every 23 months for best performance (depending on your usage). Installing the filters is fairly easy and requires no tools. Simply remove and replace from your machine unit when needed. 1Energy 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. 2Low Density Construction: Low wind resistance, higher efficiency and less pressure with manufacturer proven advanced low energy and low density construction technology. 3For 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. 4Remove 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. 5Wide 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.