| 165 / | HD | HEAT EXCHANGE |
| DIG 228 | DD | WITH FAN OR PUMP {3} |
| DIG 302 | DD | .~ Rotary gas pump {7} |
| DIG 311 | | .~.~ Including particular flow deflector (e.g., shroud, diffuser, etc.) {2} |
| DIG 312 | DD | .~.~.~> Plural parallel deflectors |
| DIG 313 | DD | .~.~.~> Deflector with curved surface |