The Soler and Palau MFL-400 G4 is a duct mounted filter box designed to improve air quality in ventilation systems. With a 400mm size and G4 grade filter, it effectively captures dust, debris, and other airborne particles, helping protect downstream equipment and maintain clean airflow. Its durable construction allows easy integration into residential, commercial, or light industrial ducted systems. The MFL-400 G4 provides reliable filtration, ensuring healthy indoor air and enhancing the efficiency and longevity of ventilation equipment.