We have a building with fire rated and secure compartments that are less than the NFPA 13 minimum design areas so we have calculated those areas using the room design method where the compartments comply. Two are fire protected with preaction sprinklers and 23.4.4.2.5 seems to imply that where a design area is flowing less than what the density would be across the minimum required design area, then a "kicker" needs to be added to raise the flow rate to that figure. Since we're in Light Hazard and the design area is only about 1,000 sq. ft., we're flowing about 150 GPM. But they're coming after us for 1,500 x 1.3 = 1,950 saying the required flow rate is 195. If it's LH, we can downward adjust and the demand drops to 117 which we satisfy. In all my years I've never had this section thrown at us so could use any help or opinion regarding exactly how this section should be applied.
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