Genuine Euro-Pro Fantom Twister replacement HEPA Filters. Each Box contains 3 HEPA Exhaust Filters. Depending on usage and conditions, the HEPA filter lasts between 3 and 6 months; however, vacuuming large amounts of extremely fine dust, powder, or similar materials over a long period of time may decrease airflow performance through the filter. If this occurs, it may become necessary to replace the HEPA filter more frequently. Designed to fit Fantom Twister bagless upright model FM740, Genuine Euro-Pro Fantom part number XFH740, XFM740 & EU-18110.