| 165 / | HD | HEAT EXCHANGE |
| DIG 228 | DD | WITH FAN OR PUMP {3} |
| DIG 302 | DD | .~ Rotary gas pump {7} |
| DIG 303 | DD | .~.~ Annular heat exchanger {1} |
| DIG 304 | | .~.~.~ Axial impeller {2} |
| DIG 305 | DD | .~.~.~.~> Located at heat-exchange housing inlet |
| DIG 306 | DD | .~.~.~.~> Located at heat-exchange housing outlet |