The Helios Fans RSKK 125 is a backdraught shutter designed for direct installation within duct systems. It fits securely on the inlet or outlet side and can be mounted in any position to prevent reverse airflow.
Constructed with a durable plastic casing and flaps, this shutter is lightweight and corrosion-resistant. A high-quality stainless steel return spring ensures reliable automatic closing when airflow stops or reverses. Suitable for air systems with temperatures up to 70 °C, the RSKK 125 is ideal for residential and light commercial ventilation systems that require dependable one-way airflow control.