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Hi @mohamad_kanso,
Welcome to the community! If you want to, you can introduce yourself by clicking on this link Introduce yourself 🙆. We would love to get to know you!
Could you please give us more details about your question? For instance, how do you plan to create the ducts? Where do you intend to perform the calculations? Are you using Python, Grasshopper or Dynamo? Moreover, where does Speckle fit into this workflow?
Providing more context will allow us to assist you better. Thank you!