The high performance industrial vacuum cleaners free themselves from the simple concept of "vacuum cleaner" to become machines for material handling and pneumatic conveying. With their enormous power (turbines up to 25 kW) in fact they can carry powders and solids with many features for tens or hundreds of meters, and then discharge them via hoppers or separators. For this very reason Delfin's Heavy duty three-phase industrial vacuum cleaners , which can be found in the DG HD line, are very often used as a central vacuum unit in centralized vacuum systems. Given the great power these are almost always combined with systems of pre separation and hoppers which are, in turn, designed and constructed based on the needs of the end user.