(1)
If a fire alarm system is installed, an air-handling system shall be designed to prevent the circulation of smoke upon a signal from a duct-type smoke detector if the air handling system
(a)
serves more than one storey,
(c)
serves more than one fire compartment required by Sentence 3.3.3.5.(2) or Sentence 3.3.4.11.(2), or
(d)
is not provided with fire dampers as permitted by Sentence 3.1.8.8.(4).