Impeller directly mounted on outer rotor for shorter axial dimension; fully enclosed design - high eficiency, low-noise, low vibration,maintenance-free; insulation class B or F, service life >30,ooo hours.Direct replacement for conventional axial flow fans; also suitable for kitchens,industrial and mining enterprises with heavy oil fume or dust.Wire guard / High drum / Low drum/ Square / Post-mounted / Fixed / Pedestal/Portable /Industrial frequency (9 types total).Explosion-proof (CBF) and corrosion-resistant (FT35-11) versions available upon request.