NFPA 13, 07ed
ESFR System What are the obstructions rules concerning a fabric supply duct installed below an ESFR system. The RTU will shut down and collapse the duct under any of the following conditions – Flow switch activation, heat detector and pull stations. I don’t think it should be considered an obstruction but we have a AHJ that is concerned that there could be up to a 60sec delay if the collapse is triggered by the flow switch and is requiring sprinklers below unless we can show otherwise. Thanks, Dewayne
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