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