MERV 13 filters

The third bullet of IEQ 5 states the following: In mechanically ventilated buildings, each ventilation system that supplies outdoor air shall comply with the following: – Particle filters or air cleaning devices shall be provided to clean the outdoor air at any location prior to its introduction to occupied spaces. – These filters or devices shall be rated a minimum efficiency reporting value (MERV) of 13 or higher in accordance with ASHRAE Standard 52.2. We have several AHUs (Air handling units) located on the roof of our building, and many FCUs (Fan Coil units) installed and located inside of our building. My understanding of the above is that we have to have MERV 13 filters only for the AHUs as they supplies outdoor air, and not the FCUs. Could someone please confirm?