Compatibility:Our AP-T40 replacement filters compatible with HoMedics TotalClean air purifier models AP-T40FL, AP-T40, AP-T40WT, AP-T43-WT, AP-T45-BK and AP-T45-WT, and Costco exclusive model 1461901. Note: The Filter do not fit with AP-T20/T22/T30 series units Triple-layer Filtration: The AP-T40 replacement filter is designed to trap 99.97% airborne particles down to 0.3 micorns including pet dander, dust, pollen, smoke and VOCs for homes with pets.The air filter's design lets you install the filter correctly on the first try, making maintenance a simple Odor-Reducing Activated Carbon: Integrated carbon layer actively neutralizes persistent household odors from cooking (like frying bacon), pets, or fireplace smoke, promoting a fresher indoor atmosphere Filter Replacement Tips:To ensure that your air purifier maintains its optimal performance, It is recommended that you replace the filter every 10-12 months. This may vary based on usage -frequency and environmental air quality If you're unsure about compatibility Or any other questions, just contact us. We're here to make sure it works perfectly for you AP-T40FL True HEPA Replacement Filter Compatible with Homedics TotalClean 5-in-1 Air Purifi-er