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Problem with Duplicate Name, Overwriting existing object

Hi everyone,

I'm trying to add a fan in relief air from AirLoopHVAC:OutdoorAirSystem to control the ratio between Outdoor air and Return air in mixing box (by control the air flowrate between relief air and mixed air, because I could not place fan in outdoor air and return air). When I added Fan:VariableVolume in Relief Air to the AirLoopHVAC:OutdoorAirSystem:EquipmentList like 5ZoneAirCooledConvCoef.idf (line 2690) but it warned me below:

  • Severe * Duplicate name found. name: "West Zone Relief Fan". Overwriting existing object.

This is my model (I added West Zone Relief Fan to West Data Center OA Equipment).

Thank you all for support and helping me with this problem.