an air flow passage through which grass cuttings are discharged from {HEAD ~ said cutting chamber} in a current of {TAIL ~ air} 
an air flow passage through which grass cuttings are discharged from { HEAD ~ said cutting chamber } in a current of { TAIL ~ air }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL