Hello friend . In dynamo we have a node like bellow pic that extract side reference of normal duct, but I need a node or script for fabrication duct that do same work, does any node or script is for fabrication parts?
I dont use fabrication so im not sure is it possible, becourse its some mesh if i remember…you could try create a detail curve/refplanes on these element and meausure them …maybee…but im probably wrong 
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I can get the element reference from fabrication , but fail in dimension by ref node, for me…not sure why…but here is a way with refplanes, that would work
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tanx alot Mr. @sovitek . this guide help me solve the problem