The Helios MTVA 125 is a high-quality exhaust air valve engineered for efficient ventilation across various room types, particularly where non-combustible components are necessary. It comes with a preset volume flow secured against unauthorized adjustment, ensuring stable and consistent airflow. An epoxy powder-coated finish provides reliable corrosion protection, while the surrounding foam ring ensures an airtight seal to eliminate lateral air leakage. This valve offers a durable and maintenance-free solution for controlled exhaust ventilation in demanding environments.