Duct Isometric chart Duct Isometric chart Jams (Mechanical) (OP) 1 Aug 17 06:43 My dears.. here.. Can anyone explain me what is Duct Isometric chart? I am new to this field/ I know Psychrometric chart. but this is I received from the consultant. they want this. RE: Duct Isometric chart dbill74 (Mechanical) 1 Aug 17 12:52 Need to ask the person who requested to clarify. Likely asking for a 3D rendering view from an angle that is not plan view or an elevation. Can be useful for clarifying how thing go together or identifying possible conflicts. If drawing in 3D such as with AutoCAD MEP or Revit, it's not hard to produce, otherwise can take a lot of time. Not a required view to put on construction drawings. As much as I see them, it's not surprising people think they are required.