| 165 / | HD | HEAT EXCHANGE |
| DIG 92 | DD | WITH VALVE OR MOVABLE DEFLECTOR FOR HEAT EXCHANGE FLUID FLOW {6} |
| DIG 109 | DD | .~ With by-pass of heat exchanger or heat exchanger section {2} |
| DIG 120 | DD | .~.~ U or serpentine heat exchange flow path {2} |
| DIG 121 | | .~.~.~ Serpentine heat exchange flow path |