G.MI.C version with internal one or two-speed gearbox and counterfan. - aluminium fan with variable pitch blades. - straighten vanes counterfan in intake. - one or two-speed gearbox with disengagement and centrifugal clutch in rubber. - hot galvanised air duct. - stainless steel nozzle bars. - accident prevention devices in compliance with standards. - optional mechanical clutch with linings. - optional galvanising and painting.