• Pickled and phosphated steel housing with polyester powder-coated finish, resistant to the aggressive action of atmospheric agents. • Nominal diameter 250 mm. • 3 speeds AC motor of external rotor type with thermal overload cutout and shaft turning in ball bearings, coupled to backward curved impeller. • Minimum air flow 600 m3/h Maximum air flow 1000 m3/h • Operation controllable by remote sensors monitoring: Temperature, Relative Humidity, Smoke and Presence • Zinc-coated steel brackets for wall mounting • Vortice speed controller included.