• Material: self-extinguishing PP thermoplastic resin, rated V0. • Nominal diameter 315 mm. • Motor-fan, speed adjustable through IRM5 2B optional control (cod. 12861), consisting of: o AC motor with thermal overload cutout and shaft turning in ball bearings, o backward curved impeller. • Operation controllable by remote sensors monitoring: Temperature, Relative Humidity, Smoke and Presence. • Zinc-coated steel brackets for wall mounting.