Helios Fans RR 125 C

The Helios RR 125 C is a two-speed centrifugal fan built for inline installation in circular ducting, ideal for handling medium airflow volumes under high resistance conditions. Constructed with a robust galvanized steel casing, it features integrated spigots compatible with standard duct sizes for straightforward installation. The backward-curved centrifugal impeller, made from durable polymer, is directly mounted on the motor and dynamically balanced to ensure efficient, low-noise operation. It is powered by a fully enclosed, single-phase external rotor motor that is maintenance-free and includes thermal protection and sealed-for-life ball bearings. Speed can be controlled using an electronic controller, a 5‑step transformer controller, or through two-speed operation via the DS 2/2 accessory (Ref. no. 1267). This fan is an excellent choice for reliable and quiet ventilation in systems with higher pressure demands.