As I fear will often be the case the question cannot be answered with the provided info. We need to know if there are any uncovered openings that are glazed (skylights, glass block, glazed garage doors, sidelights or entry glazed doors etc.) We also need to know a rating for the garage door or other exterior doors which are not covered.
With respect to the letter from the installer since no NOA or FBC is stated on the letter the best you could do was to check off N if all glazed openings have protection and then N1, N2, or N3 dependent upon what catagories the nonglazed fell into.
Nobody said it was gonna be easy, I’ll wait and see what others might say but this is how I would handle it ASSUMMING what I have. It might help to have the candidate asking the question to complete the form with all the photos and blank out the property info and his name. We kinda need to know the location in order to answer some of the questions.