The Helios Fans ZLA 125 IB HY 6 – 45 is a humidity-responsive inner panel designed for use with the ZLA 125 ventilation system. Made from sturdy white polymer, it automatically adjusts airflow based on the indoor humidity level, ensuring optimal ventilation performance. The panel is equipped with an ISO Coarse 30% rated dust filter, effectively capturing larger airborne particles to enhance air quality. This component is ideal for environments where variable moisture levels require dynamic airflow regulation while maintaining clean and efficient ventilation.