An exchangeable flow conditioning insert includes a flow resistance element and is adapted to be arranged in the main flow duct relative to the bypass duct in an axial installation position such that {TAIL ~ the flow resistance element} generates a pressure difference between ports of {HEAD ~ the bypass duct} at the main flow duct 
An exchangeable flow conditioning insert includes a flow resistance element and is adapted to be arranged in the main flow duct relative to the bypass duct in an axial installation position such that { TAIL ~ the flow resistance element } generates a pressure difference between ports of { HEAD ~ the bypass duct } at the main flow duct
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