Mohamed, There is an "open window" in most of the W4-lib.dat window data files. It is at least in the American, German, and Basic libraries as window ID 10001. The trick with this window, however is not so much assessing the thermal properties of it but to asses the amount of airflow that passes through it. Kind regards, David On 2/6/2013 10:12, Mohamed Adel wrote:
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