The fan Exafan, fulfils with all the exigencias to go out airoso of the use , in climates of extreme heat or cold glacier. Likewise it does not constitute any problem the work constantly in the most adverse environingingments, from the more polvoriento to the most humid and corrosivo. We do not have to forget, that in his interior late a powerful and effective engine, being worthy of resaltar his docile and linear regulation. This drives to an optimum relation between consumption and discharge supplied