PERFECT FIT - The AP-T40 Replacement Filter is designed for HoMedics 5-in-1 Tower Air Purifier models AP-T40FL, AP-T40, AP-T40WT, AP-T43-WT, AP-T45-BK and AP-T45-WT, and Costco exclusive model 1461901, with noted incompatibility for AP-T20/T22/T30 series units. 3-STAGE PURIFICATION - This three-stage filtration system integrates a pre-filter for capturing large particles, that filters out micron airborne contaminants, and an activated carbon layer with 2.5x enhanced density for neutra lizing household odors and VOCs. COST-EFFECTIVE BUNDLE - Each package contains 1 complete filter and 1 UV-C Bulbs , manufactured to exact 7.5"×7.5"×11.8" dimensions for airtight sealing. The industrial-grade construction maintains stable airflow for 6-8 months under average 8-hour daily operation. EFFORTLESS SETUP - With tool-free installation completed in under two minutes, the rigid frame design prevents warping while remaining fully compatible with your purifier's maintenance alert system through precise dimensional matching. *After UV-C light installation, press and hold the 'ION' button for 5 seconds to reset the bulb status indicator.* CUSTOMER SERVICE - Supported by direct Amazon communication channels with 12-hour response commitments, we offer free replacements for transit-damaged filters and troubleshooting guidance to ensure year-round air quality control. AP-T40 Replacement Filter & UV-C Replacement Bulbs Compatible with HoMedics 5-in-1 Tower Air Puri-fier Models# AP-T40FL, AP-T40WT, AP-T43-WT, AP-T45-BK and AP-T45-WT,1461901(Costco Model)