- Bases 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 switch Available, depending on the model, in 2, 4 o 6 poles.Motors- Single-phase external rotor motor 230V-50/60Hz (CRHB-N), IP54, clase F, with safety thermal overload protection. Speed controllable by voltage.- Three-phase external rotor motor 230/400V-50/60Hz (CRHT), IP54, class F, with safety thermal overload protection. Speed controllable by frequency inverter and by voltage.
