To exempt portable extinguishers from the application of [and to supersede] Sentence 4.10.8.1.(1), if certain measures are taken [hose stations installed at each exit and spaced so that the travel distance to each station is not greater than 25 m].
This is to limit the probability that fire suppression operations using portable extinguishers will be delayed or ineffective in controlling or suppressing a fire, which could lead to the spread of the fire, which could lead to harm to persons.