• Pickled and phosphated steel housing/roof mounting plate with polyester powder-coated finish, resistant to the aggressive action of atmospheric agents. • Nominal diameter 100 mm. • 3 speed fan through TRIO-CA optional control (cod. 12869), consisting of: • AC motor with thermal overload cutout and shaft turning in ball bearings, • backward curved impeller. • Operation controllable by remote sensors monitoring: Temperature, Relative Humidity, Smoke and Presence. • Zinc-coated steel brackets for wall mounting.