The HELI RR250C radial duct fan from Helios is a powerful ventilation fan specifically designed for direct installation in duct systems. It is ideal for moving medium and small air volumes, even against high resistance. The housing is made of galvanized steel sheet and is equipped with round connection flanges that are compatible with standard ducts. The fan features a radial impeller with backward-curved blades made of plastic, which is directly pressed onto the motor and dynamically balanced as a unit. This ensures quiet operation and high efficiency. The single-phase external rotor motor is maintenance-free and constructed in a closed design. The speed can be controlled by reducing voltage, and the fan is equipped with built-in thermal contacts as well as sealed, low-noise ball bearings with long-term lubrication.

• Direct installation in duct systems for efficient air movement
• High-quality housing made of galvanized steel sheet
• Dynamically balanced radial impeller for quiet operation
• Maintenance-free external rotor motor with thermal contacts
• Energy-efficient speed control through voltage reduction.