{HEAD ~ A motor} has {TAIL ~ speed and airflow parameters} and a built in constant airflow regulator 
has
{ HEAD ~ A motor } has { TAIL ~ speed and airflow parameters } and a built in constant airflow regulator
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH