If {HEAD ~ the height} of the core partition is lower than {TAIL ~ the tip} of the nozzle of the core burner, the core partition is not capable of exerting the effect to prevent the airflow 
is lower than
If { HEAD ~ the height } of the core partition is lower than { TAIL ~ the tip } of the nozzle of the core burner , the core partition is not capable of exerting the effect to prevent the airflow
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH