It seems like maybe the StraightComponentStraightComponent is the answer to my question.

But the use case I am struggling with is after doing terminal = thermal_zone.airLoopHVACTerminal.get including doing .empty? check before hand, when using an object method like .setMaximumAirFlowRate it returns a hash error on the Terminal object. It seems like the ambiguity on what kind of Terminal might be the issue but any pointers would be very much appreciated. Thank you.