These openings 518 allow a cooling medium to flow through {TAIL ~ the passage} 516, which assists in removing {HEAD ~ heat} from the coils 306 a,b 
These openings 518 allow a cooling medium to flow through { TAIL ~ the passage } 516 , which assists in removing { HEAD ~ heat } from the coils 306 a , b
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH