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After some work in Green Building Studio and Revit MEP 2014 I have found a mistake in make-up air parameters which Revit exports to gbXML. If project units are in SI, Revit writes and GBS wrong interprets settings for fresh air per square meter. In IP units there is no mistake. When a model is translated to GBS in SI units the results are absolutely wrong! Be carefull. Service Pack1 did not fix that problem.
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