Form Filling - Mixed Ventilation (Natural & Mechanical)

Hi, our commercial building uses both mechanical and natural ventilation. We have 3 different types of spaces regarding ventilation: a) There are some working zones that comply with the natural ventilation requirements (4% - 25feet) on 100% of the office's surface. b) Some offices are isolated from windows and therefore will be ventilated 100% mechanically. c) Some offices have natural ventilation through windows, but cannot get natural ventilation on the 100% of their surface, due to distances longer than 25 feet to the windows. Therefore, additional mechanical ventilation will be provided. When filling the form, I am choosing the VRP compliance calculator for both mechanical and natural ventilation. My questions are: 1) For offices type "c", should we include this zones in both VRP compliance calculators? 2) Let's say zone X is a 300sf office type "c", which has 100sf naturally ventilated by windows. When filling the mechanically ventilation VRP calculator, shall we use 200sf as for the area of zone X? 3) For the same zone X, when filling the naturally ventilation VRP calculator, shall we use 100sf as for the area of zone X? Thanks!