TECHNICAL DOCUMENTATION
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The industrial fan is a turbo operating machine receiving mechanical energy and using it, by means of a bladed impeller, to keep a continuous air flow or other gases passing through the same, providing a work per mass unit not greater than 25 kJ/kg (UNI EN ISO 13349).
Fans are classified based on the maximum deliverable pressure (high, medium, low pressure fans), the trend of flow through the impeller (centrifugal or axial fans) , and the drive systems (directly coupled or transmission belt drive, or elastic joint).