Helios Duct Fan SilentBox, 1 PH SB 250 C

Radial duct fan with sound-insulated casing. Casing made of galvanized steel sheet with round connection spigots compatible with standard ducts. Sound-absorbing perforated sheet metal inner lining, backed with 50mm thick mineral fiber board. Removable cover. Fan chamber and casing spiral freely accessible. Motor and impeller can be pulled out. High-performance drum impeller with forward-curved blades made of galvanized steel sheet. Vibration-free operation due to dynamic balancing according to quality grade G 6.3 VDI 2060 and DIN ISO 1940. Single-phase AC external rotor motor, enclosed design, maintenance-free, speed controllable by voltage reduction, built-in thermal contacts, sealed, low-noise ball bearings with long-term lubrication.