An NFPA enclosure integrity test result is typically reported in the form of an "agent hold time" which represents the duration for which the room will retain at least 85% of the design concentration in order to suppress a fire and to ensure it does not reignite. This retention time inversely proportion to the leakage area of the room which is the major factor. Location of leaks, height being protected, the presence of continual mixing and clean agent being used will affect the hold time also.