The Helios ELF-ALB 80/50 M5 is a fully synthetic replacement filter designed for ALB fresh air boxes. It consists of synthetic filter fleece supported by a fiberplast frame, providing robust and efficient filtration. Certified according to DIN EN ISO 16890 standards, this filter achieves an ISO ePM10 70% rating, corresponding to filter class M5. It ensures reliable air filtration to maintain clean and healthy air within Helios ventilation systems.