The Helios ELF-KWL Yoga 400/ePM10 60% is a replacement air filter developed for the exhaust air side of the KWL Yoga 400 (Style) ventilation system. With an ISO ePM10 60% (M5) classification, it efficiently removes medium-sized particles to maintain air quality and protect internal components. This filter is provided as a single unit, offering a simple and effective replacement solution.