165 / | HD | HEAT EXCHANGE |
120 | DF | WITH IMPELLER OR CONVEYOR MOVING EXCHANGE MATERIAL {1} |
121 | DF | .~ Mechanical gas pump {1} |
122 | DF | .~.~ Heating or cooling means and gas pump in housing {2} |
124 | .~.~.~ Verging gas flow {2} | |
125 | DF | .~.~.~.~> Radial flow through annular heating or cooling means |
126 | DF | .~.~.~.~> Single inlet, plural outlets {1} |