Radial duct fan RADAX RR for direct installation in the duct system. Housing made of impact-resistant plastic with round connection pieces adapted to standard ducts. High-performance radial impeller with backward-curved plastic blades. Vibration-free operation thanks to dynamic balancing in accordance with quality level G 6.3 VDI 2060 and DIN ISO 1940. Drive: Single-phase AC external rotor motor, built-in thermal contacts wired in series with the winding, closed design, maintenance-free, sealed, low-noise ball bearings with long-term lubrication.