The Helios Fans RSK 315 is an automatic backdraught flap designed for direct installation in circular duct systems. It effectively prevents reverse airflow under both overpressure and underpressure conditions, using a spring-lock mechanism for automatic operation.
Constructed with a galvanized steel housing, aluminum flaps, and a stainless steel return spring, the unit offers robust performance and long service life. For horizontal duct runs, the axis of rotation should be installed vertically to ensure proper flap movement. In vertical installations, the flap operates effectively only with upward airflow.
Ideal for residential, commercial, and industrial ventilation applications, the RSK 315 helps maintain consistent airflow direction and protects systems from backflow.