This situation may be one where you need to
"let the Manufacturer and the Building Department Fight It Out"
Try looking through the Company's website for documents which support the claim(s), then present these items to the Inspector or Building Department to see if they accept it or not.
If no documents are available to support the claim(s), or the AHJ (Building Department) does not accept the documents, let the Manufacturer take over, and come up with a method which will conform to your DBS's minimums plus not be a complete loss for you and the Mfr.
Good luck, and let us know what the outcome is.
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!