The Helios ELF-ALB 40/20 G4 is a robust synthetic air filter designed for coarse dust filtration in HVAC systems. It features a fully synthetic filter fleece supported by a strong Fiberplast frame and is tested to meet DIN EN ISO 16890 standards. With an ISO Coarse 90%/F4 classification, this filter effectively captures larger airborne particles, such as dust and debris, making it suitable for general ventilation needs. The ELF-ALB 40/20 G4 is ideal for protecting air handling units and ensuring consistent airflow in both residential and commercial environments