Does the 'small room rule' apply to NFPA 13D sprinkler systems?
I could not find any mention of it in 13D. If 13D does not allow it, why not?
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6/18/2020 09:12:01 am
Small room rule does not apply to NFPA 13D. NFPA 13D, NFPA 13R and NFPA 13 are completely different standards even though they all are installation standards for sprinkler systems.
6/18/2020 10:10:29 am
Just adding to the above comment,
6/18/2020 10:42:40 am
Also Small Room is defined as a light hazard area. 13D would be considered a residential area. Another interesting thought is this should only apply to standard spray sprinklers as a residential sprinkler operates more like an extended coverage sprinkler and are listed to only operate at a listed coverage at a given pressure. Standard spray sprinklers are listed to be spaced per NFPA 13.
6/19/2020 08:11:58 am
To add to Jeremiah's thought, the residential sprinkler heads act a lot more like extended coverage heads compared to standard spray in regards to obstructions as well, so that is also something to keep in mind when designing their coverage.
6/18/2020 02:50:35 pm
No it can't, but there's not much of a need for it. Most listed residential sprinklers allow for greater spacing than standard coverage sprinklers used in full 13 applications. with 20x20 spacing you can be 10-ft off of every wall which is greater than the small room rule of 9-ft from a single wall.
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