| 165 / | HD | HEAT EXCHANGE |
| DIG 135 | DD | MOVABLE HEAT EXCHANGER {4} |
| DIG 139 | DD | .~ Fully rotatable {5} |
| DIG 145 | DD | .~.~ Radially extending hollow arm on rotating shaft traverses furnance shelf (e.g., rabble arm, etc.) {1} |
| DIG 146 | | .~.~.~ Angled blade suspended from arm for advancing material |