The portion of the air outlet opening around the nozzle should have {HEAD ~ a cross sectional area} in {TAIL ~ 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 
in
The portion of the air outlet opening around the nozzle should have { HEAD ~ a cross sectional area } in { TAIL ~ 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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