More robust than the industrial range, support extreme working conditions, making them perfect for ventilation of mines, tunnels, roads, transformers, subways, tunnels drilling phase, and public works in general. When the required pressure is greater than that provided a ventilator, it can be coupled in series, forming multistage equipment, performance and much higher pressures. Another feature of this series is the high ratio of cube-helix, much higher than normal models, which allows to obtain much higher pressures.