The Helios SVE 125 is a practical and economical duct insert designed to regulate air volume in central ventilation systems. It also supports noise dampening and pressure balancing. Constructed from mould- and fire-resistant foam, it meets the stringent requirements of emission class M1 and fire class B. The SVE 125 features pre-punched holes that simplify adjustment and ensure consistent airflow control. In the event of a fire, the material prevents the emission of harmful smoke or toxic gases. It is fully compatible with all standard poppet valves, offering both safety and convenience