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A couple of things about window in OS/E+:

• A construction just shows you what materials make it up, you need to go to the materials to see their properties.
• In your case, the fixed window material is a simple glazing system window material. This type of material just has inputs for U-Factor, SHGC, and VT (note that this is for the window assembly including the frame, not the center of glass window values).
• If you want to actually build the glazing type you need to build a window with glazing materials and layers, glass + air + glass for a double pane. Note that if you are doing these then you need to have frame and divider objects for your windows as well. See here