Consider a shed having only roof is using for dining. All sides are open to enter and exit. Is it mandatory to have both automatic detector and Manual Call point or only manual call point is enough???
The simplest answer is 'it depends'.
The first item to consider is that NFPA 72, does not tell us when to install fire alarm system. Its tells us how to install a fire alarm system. Its is the building safety codes such the 2018 NFPA 101, Life Safety Code (LSC), that tells us when a fire alarm system is required.
"NFPA 72 covers the application, installation, location, performance, inspection, testing, and maintenance of fire alarm systems, supervising station alarm systems, public emergency alarm reporting systems, fire warning equipment and emergency communications systems (ECS), and their components."
The second item to consider is the LSC's occupancy classification of the building's spaces. Dining spaces that assemble less than 50 people would be incidental to the predominate occupancy of the building. Dining spaces that assemble 50 or more people would be an assembly occupancy.
So... where do we go for here? Section _.3.4 of the LSC occupancy chapters 12 through 43 should be consulted for the detection and alarm system requirements for your particular occupancy classification. If required by the occupancy chapter, the core chapter's Section 9.6 will give us the details for the complete fire alarm system including fire detection, alarm, and communications.
You will need to elaborate (present a theory, policy, or system in detail) about the LSC occupancy classifications and occupant load of the building, before a meaning answer can be found.
Remember - Compliance is always determined by the authority having jurisdiction.
I would go based on risk assessment, and probably would get a manual call point or a portable fire extinguisher justified.
It is an open structure with egress points available on all sides and only used for a few hours every day maybe, so yeah.
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