Helios Fans RR 315

The Helios RR 315 is a centrifugal circular duct fan engineered for direct integration into duct systems handling medium to small air volumes under high resistance. Its rugged casing is constructed from galvanized sheet steel with integrated spigots that fit standard duct sizes for easy installation. The backward-curved centrifugal impeller, also made from galvanized steel, is directly mounted onto the motor and dynamically balanced as a unit to ensure high efficiency and quiet performance. The fan features a single-phase AC external rotor motor in an enclosed design that is maintenance-free, equipped with built-in thermal contacts, and fitted with low-noise, long-life ball bearings. Speed control is possible via an electronic controller or step transformer, offering flexible ventilation performance in demanding applications.