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Fans are such simple and common equipment, that we tend to underestimate their importance, giving them our attention only when their performances are not meeting our criteria. General mechanical ventilation is typically carried out by two co-operating installations: one for the inlet of fresh air into the room or technological space, and the second for absorbing the vicious air. Both fresh air and the evacuation of the air, the fans must be equipped with a diffuser. When the fan blows freely into the atmosphere wi...