Fenestration and doors leakage

Field-fabricated means that the door or window is actually made or fabricated on-site, not just installed. So field installed and field fabricated are not the same. Assuming you are installing the fenestration and doors and not making them - you can request the testing results from the manufacturer which should demonstrate compliance for those products. This requirement is for the products, not the installation.

There was a LEED v2.2 CIR Ruling dated 5-21-09 that is somewhat applicable and you may be able to get some ideas from it. Are there any local standards for air leakage related to window and door products made locally? While this is a mandatory provision in 90.1 the reality is that you are not required to submit any of these certifications for LEED and the reviewer will not ask for them unless you point out the issue. Regarding the field fabrication exclusion you would have to ask the folks who write 90.1. I can only speculate that the exclusion would allow custom, one-of-a-kind windows and doors to be installed which would be very expensie to get tested and certified.