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 freely accessible. Motor and impeller can be swung out. 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. 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.