According to Ashrae 90.1 air leakage for fenestration and doors shall be determined in accordance with NFRC 400 and it shall be done by an accredited laboratory. Also at the last paragraph it reads under the exceptions: a Field-fabricated fenestration and doors.
In the country of the project there are no accredited laboratories to run such a test. The doors and fenestration will be field installed.
It is not clear to me if you need or not the certification since the exception clearly states that field fabricated items do not apply. It makes no sense to me that clearly the intent is having a tight construction and in the exceptions they are stating the opposite. Can you please clarify and also how can I prove compliance, for example, even though I bring the windows from the states with the certified window-frame assembly, it will still have to be installed here.