Minimum number of firefighting shafts by floor area

Where a building is to be provided with firefighting shafts the minimum number (subject to paragraph 6.5) should be – (a) where a building is fitted throughout with an automatic sprinkler system complying with the relevant recommendations of BS 5306-2 or BS EN 12845 as given in Table 6.1 for the appropriate floor area; or (b) where a building is not fitted throughout with such a sprinkler system – at least one for every 900 m2, (or part thereof) of floor area of the largest storey given in paragraph 6.3(a) to (d) as appropriate.