To limit the probability that portable extinguishers will not be appropriate for the type of fire hazard present, which could lead to their being ineffective in suppressing or controlling a fire, which could lead to the spread of fire beyond the point of origin, which could lead to damage to the building.
To limit the probability that portable extinguishers will not be readily accessible, which could lead to delays in carrying out fire suppression operations using the portable extinguishers, which could lead to the spread of fire beyond the point of origin, which could lead to damage to the building.