The portion of the air outlet opening around 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 {HEAD ~ the range} of from 0.65 to {TAIL ~ 2.00 millimeters} 
of to
The portion of the air outlet opening around 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 { HEAD ~ the range } of from 0.65 to { TAIL ~ 2.00 millimeters }
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