The client said it should be 7m. In other sites, they said it should be 9m. Can anyone please clarify regarding the same?
There is no listed spacing for smoke detectors. Use NFPA 72: A220.127.116.11.1(g)
Absolutely, there is no "listed" spacing. The aforementioned appendix is the design guideline that should be followed.
The term distance "required" can be misleading and I am sure the intent was maximum allowable distance. According to NFPA 72, the maximum allowable distance between smoke detectors in a standard room is 9.1 meters or 30 feet (US) and 1/2 nominal spacing (4.55) meters to walls or partitions at right angles. In addition, all points on a ceiling shall have a detector within .7 times the nominal spacing. In a corridor that is 3 meters or 10 feet (US) or less in width, the maximum allowable distance is 12.8 meters or 42 feet (US) between smoke detectors and 1/2 nominal spacing (6.4) meters to walls or partitions at right angles. There are many other factors to consider like the shape of the room, ceiling heights, etc. but this is the most referenced code standard. Remember, this will allow the provision of the least amount of smoke detectors. If more stringent protection is desired, then of course more detectors can be provided.
I agree. One would have to look at the manufacturer's instructions, as well as the building codes for your particular area, and also NFPA 72. Quite a bit of information comes from NFPA 72.
There was an inspection held recently for the above building. The inspector said us that the distance between the smoke detectors should be reduced to 7m, (not 9m) as both the smoke detectors can cover the entire area. @nicksasso @petecullipher
It sounds like he was simply making a suggestion, based upon your particular installation.
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