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The room design method is based upon sprinkler activation in the roomThis is typically not a design method used for large, wide open spaces, even though the space may well look like a big room, such as a ball room in a hotel...a big room, but not one in which a room design method sprinkler system would be installed. that creates the largest water flow demand. The density selected and the area of application/operation are selected from the same table that is used for the density/area method for the particular occupancy hazard. Typically, the room will be smallerFor example, the sprinkler design in a condominium project is designed to light hazard, and from the curves, it requires a density of 0.10 gpm/sq. ft. for the most remote 1,500 sq. ft. However, the largest room is most likely going to be much less than the 1,500 sq. ft. So, the sprinkler density is going to be based on a lower number of sprinklers flowing, in that largest room only. than the areas of application/operation listed in the table below, as this allowance is meant to be applied to smaller areas. There are a number of rules that apply to the room design method, and if they aren't met then the area of application/operation becomes the area listed for the density on the table below.
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