The HELI VARD 250/4/2 TK RADAX high-pressure duct fan from Helios is a powerful ventilation fan designed for use in demanding applications. With its cylindrical duct sleeve and flanges on both sides, it allows for easy installation in various ventilation systems. The fan is directly driven and features a semi-axial impeller with eight spatially curved blades made of thermoplastic, ensuring high efficiency and stable airflow. The closed design and maintenance-free, low-noise ball bearings provide reliable operation over long periods. The fan is equipped with a three-phase short-circuit rotor motor that offers a Dahlander winding, making it pole-switchable and adaptable to different requirements. The dynamic balancing according to quality grade G 6.3 VDI 2060 and DIN ISO 1940 ensures vibration-free operation, which extends the device's lifespan and minimizes noise levels.

• Cylindrical duct sleeve made of galvanized steel sheet for high stability
• Dynamic balancing according to quality grade G 6.3 for vibration-free operation
• Maintenance-free motor with low-noise ball bearings
• Pole-switchable Dahlander winding for flexible applications
• Built-in guide wheel to improve airflow.