Helios Ventilatoren RR 125 C tube fan. Manufacturer: Helios Ventilatoren. Designation: Tube fan. Type: RR 125 C. Housing material: Steel. Air volume unloaded: 480 m³/h. Supply voltage: 230 V. Power consumption: 0.062 kW. With thermal protection: yes. Electrical connection: Connection terminals. Protection class (IP): IP44. Max. Air temperature: 60 °C. Motor with 2 speeds: yes. Suitable for electronic control: yes. Length: 188 mm. Diameter of the housing: 243 mm. Duct diameter: 125 mm. Connection: Flange. The Helios Ventilatoren RR 125 C inline fan is a centrifugal inline fan with 2 performance levels for direct installation in the duct system. It is suitable for conveying medium and small air volumes against high resistances. The housing is made of galvanised sheet steel with round connection pieces that are matched to standard ducts. The centrifugal impeller has backward-curved plastic blades that are pressed directly onto the motor and dynamically balanced as a unit. The fan is low-noise and highly efficient. It has a single-phase AC external rotor motor in a closed design, is maintenance-free and has built-in thermal contacts as well as sealed, low-noise ball bearings with long-term lubrication. The power is regulated by means of an electronic controller, step transformer or in two-stage operation with type DS 2/2 (accessory).