Radial tube fan with noise-insulated housing. Sound-insulating housing made of galvanized sheet steel with round connection pieces designed for standard pipes. Sound-absorbing perforated sheet metal inner lining, backed with 50 mm thick mineral fiber board. Removable cover. Fan compartment and housing spiral freely accessible. Motor and impeller can be swung out. High-performance drum impeller with forward-curved blades made of galvanized sheet steel. Vibration-free operation thanks to dynamic balancing in accordance with quality level G 6.3 VDI 2060 and DIN ISO 1940. Single-phase AC external rotor motor, closed design, maintenance-free, speed can be controlled by reducing the voltage, built-in thermal contacts, sealed, low-noise ball bearings with long-term lubrication.