We have a project in Rio de Janeiro registered under CS and to which the fan door test shall be conducted since it is composed of three residential buildings. In Brazil, the test has not been performed to any other project persuing LEED before and after more than three years searching for companies capable of conducting the test, only one has demonstrated the required know-how. Since units are very large - from 315m2 to 1,425m2 each - and the ANSI/ASTM-E779 standard is applicable to single zones only, some simulations will be required in order to determine measurements procedures for the project, and since the simulation tool for version 2003 of the standard is not available, we wonder whether version 2010 could be used. We have compaired both versions: the minor differeces are related to equipment accuracy only, and version 2010 is more restrictive.