The insert has at least one flow resistance element arranged therein between two branchings from {HEAD ~ the main flow duct} for {TAIL ~ a parallel bypass duct} 
The insert has at least one flow resistance element arranged therein between two branchings from { HEAD ~ the main flow duct } for { TAIL ~ a parallel bypass duct }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL