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I saw some designs on line, and decided to make my own. These are N scale, but can be easily changed.the .stl file is: https://www.tinkercad.com/things/7YUzCiirkt3-ac-units-and-ductworkIt is open for non-commercial use.here is an image of the printed, but not yet painted, parts: (Attachment Link) Here is a picture showing the details: (Attachment Link)