Noise-encapsulated radial fan with swing-out motor impeller unit and motor located outside the air flow. Double-walled housing made of galvanized sheet steel, soundproofed by lining with 50 mm thick mineral wool insulation panels. Suction and pressure side pipe connection nozzles with rubber lip seal. Fan door can be fully swung out for inspection and cleaning. Incl. stable mounting rails with four vibration dampers. High-performance radial impeller with backward-curved aluminum blades. Vibration-free operation thanks to dynamic balancing in accordance with quality level G 6.3 VDI 2060 and DIN ISO 1940. Three-phase motor, two-speed with star/delta connection, closed design, maintenance-free, with thermal contact, sealed, low-noise ball bearings with long-term lubrication.