[Compatible]: HSIAMEN Pre-filter is compatible with HoMedics Air Purifier Total-Clean Tower Series models AP-T40 AP-T40WT, AP-T40WTAR AP-T45 AP-T45WT & Costco 1461901, 1363711, 1356114, 1467939, 1472383, compared to part# AP-T40FL *NOTICE: This filter set is only pre-filter, does NOT include the HEPA filter or the carbon filter [Electrostatic Cotton]: Features electrostatic material that traps particles such as d^st, lint and sm0ke, extending the filter’s life. Unlike other brands, it is thinner and has low wind resistance to ensure air circulation while maintaining high filtration efficiency [Special Design]: Nylon outer pre-filter traps large particles such as pet fur, fibers and hair and supports electrostatic cotton. In contrast to other brands, we use Hook and Loop Tape which is specially designed for electrostatic cotton material and is much stronger than tape [For Optimal Performance]: Clogging of filters is the main cause of filtering efficiency. HSIAMEN pre-filter traps large particles, protecting the other filters in the first stage. It is recommended to replace the pre-filter every 3 MONTHS, depending on air quality and frequency of use [Easy to Replace]: It’s just the right size and simple to replace. No cutting needed. Maximize savings for your year-round air cleaning needs with our value bundle. We offer 24/7 customer service support. If you have any questions or concerns, please don't hesitate to reach out to us HSIAMEN Pre-Filter Compatible with HoMedics Air Purifier Filter Replacement 1461901 for AP-T40 AP-T45 TotalClean Model AP-T40WT AP-T40WTAR AP-T45WT, Fit Part# AP-T40FL, 6-Pack