• P04 pressed steel outer enclosure with polyester paint finish, resistant to atmospheric agents. • Nominal diameter 150 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 centrifugal impeller. • Operation controllable by remote sensors monitoring: Temperature, Relative Humidity, Smoke and Presence.