The grain dryer 10 further includes a heating unit 40 which is operable to draw {HEAD ~ ambient air} from {TAIL ~ the environment}, heat the ambient air, and advance the heated air into the plenum chamber 28 
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The grain dryer 10 further includes a heating unit 40 which is operable to draw { HEAD ~ ambient air } from { TAIL ~ the environment } , heat the ambient air , and advance the heated air into the plenum chamber 28
OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH