airflow limitation of lab spaces during unoccupied periods

According to Ashrae 90.1-2007 G3.1.1.d there should be a fan flow limitation for lab spaces in the baseline model during unoccupied hours. "For Lab spaces with a minimum of 5000 cfm of exhaust, use system type 5 or 7 that reduce exhaust and makeup air volume to 50% of design values during unoccupied periods" What if the design uses a fan flow limitation of 10% of design values for lab spaces ? Can this more restrictive flow limitation be used for the proposed model. Or should the flow limitation of 50% be used, which is identical to baseline model.