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