The Helios ELFBR 400 F7 is a set of replacement pocket filters intended for use with LFBR in-line air filter boxes. Each filter is made from synthetic plastic with a weight of 64 g/m² and delivers effective dust retention with a capacity of 88.6 g/m². Classified as ISO ePM1 50% (F7), these filters ensure high-performance air filtration. Supplied in a pack of two, they provide a convenient and reliable solution for maintaining indoor air quality in ventilation systems.