| 55 / | HD | GAS SEPARATION |
|
| 315 | DF | PLURAL SERIAL BASICALLY DIVERSE SEPARATING MEDIA {3} |
| 318 | DF | .~ Plural stages in unitary casing {2} |
| 320 |  | .~.~ Deflector and fibrous, filamentary, particulate solids, or cohesive sheet filter type {6} |
| 321 | DF | .~.~.~> Multiple of one type in series of parallel in flow path {3} |
| 327 | DF | .~.~.~> Filter is most upstream |
| 328 | DF | .~.~.~> Movable or movable mounted for adjustment or nonuse |
| 329 | DF | .~.~.~> Filamentary brush type or fibrous mass {1} |
| 331 | DF | .~.~.~> Conical deflector with curved or parabolic radially extending wide downstream end |
| 332 | DF | .~.~.~> Cohesive sheet-like filter {4} |