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