- Base manufactured from galvanised sheet steel.- High efficiency centrifugal backward curved impeller manufactured from high strength black injection moulded plastic (225 and 250) or from aluminium sheet (from 280 to 355).- External rotor motor- Cowl manufactured from spun aluminium.- On-Off isolator switchAvailable, depending on the model, in 2, 4 o 6 poles.Motors- Single-phase external rotor motor 230V-50/60Hz (CRVB-N),IP54, class F, with safety thermal overload protection.Speed controllable by voltage.- Three-phase external rotor motor 230/400V- 50/60Hz (CRVT-N), IP54, class F, with safety thermal overload protection.Speed controllable by frequency inverter and by voltage.
