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The attachment is very interesting and elaborate. Thanks for sharing that. I think you should go with the recommended iterations suggested by the vendor in the attachment. Start with an assumed U value and work your way to see if you meet the requirements. I would personally not worry about even considering the ductility of the structure when dampers are being used as ductility difference is significant. I am not aware but I would suggest going with the vendor suggested method as you are using a market product and adopting a different approach from what is recommended might end you up in liability issues if things go south. Thanks.