The portion of the air outlet {HEAD ~ opening} around {TAIL ~ the nozzle} should have a cross sectional area in the range of from 5 to 15 square millimeters and should be annular in shape with a generally uniform radius in the range of from 0.65 to 2.00 millimeters 
around
The portion of the air outlet { HEAD ~ opening } around { TAIL ~ the nozzle } should have a cross sectional area in the range of from 5 to 15 square millimeters and should be annular in shape with a generally uniform radius in the range of from 0.65 to 2.00 millimeters
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