{HEAD ~ End} of the trough is connected to exhaustor means which suck {TAIL ~ the fibre fleece} towards injector  
{ HEAD ~ End } of the trough is connected to exhaustor means which suck { TAIL ~ the fibre fleece } towards injector
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH