The Elta 018 – 400-DAMPER is a 400mm damper engineered to prevent the reverse flow of air when the ventilation fan is not in operation. Constructed with a robust galvanised sheet steel casing, it features spring-operated aluminium blades that automatically close to block backdrafts, ensuring efficient airflow control and system protection. This damper is suitable for use in various ventilation and HVAC applications requiring reliable air flow management.