The Helios ELF 400 filter mat is crafted from durable synthetic fibre and classified as ISO Coarse 30% (G2), ensuring effective dust filtration and maintaining proper airflow in ventilation systems. Its design efficiently traps coarse dust particles, helping to protect air handling units and improve overall air quality. Perfect for applications where reliable filtration is essential, the ELF 400 filter mat supports the longevity and optimal performance of your HVAC system.