| 165 / | HD | HEAT EXCHANGE |
| DIG 454 | DD | HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16} |
| DIG 471 | DD | .~ Plural parallel conduits joined by manifold {15} |
| DIG 481 | | .~.~ Partitions in manifold define serial flow pattern for conduits/conduit groups {1} |
| DIG 482 | DD | .~.~.~> Partitions are separate members |