A part of the heated air is used as {HEAD ~ the heated air} for {TAIL ~ drying} and the other is exhausted to the open air 
A part of the heated air is used as { HEAD ~ the heated air } for { TAIL ~ drying } and the other is exhausted to the open air
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH