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You are correct. The idd shows, and code confirms, that the units are W/(m3/s).

Coil:Cooling:DX:SingleSpeed,
  N5 , \field Rated Evaporator Fan Power Per Volume Flow Rate
   \note Enter the evaporator fan power per air volume flow rate at the rated test conditions.
   \note The test conditions vary external static pressure based on total cooling capacity.
   \note This value is only used to calculate Seasonal Energy Efficiency Ratio (SEER), Energy
   \note Efficiency Ratio (EER), Integrated Energy Efficiency Ratio (IEER), and the Standard
   \note Rating (Net) Cooling Capacity which will be outputs in the EnergyPlus eio file.  This
   \note value is not used for modeling the evaporator fan during simulations.
   \type real
   \units W/(m3/s)
   \minimum 0.0
   \maximum 1250.0
   \default 773.3

You are correct. The idd shows, and code confirms, that the units are W/(m3/s).W/(m3/s). This input is a power per flow rate input for the fan power used during the rating calculations. This input is not used otherwise.

Coil:Cooling:DX:SingleSpeed,
  N5 , \field Rated Evaporator Fan Power Per Volume Flow Rate
   \note Enter the evaporator fan power per air volume flow rate at the rated test conditions.
   \note The test conditions vary external static pressure based on total cooling capacity.
   \note This value is only used to calculate Seasonal Energy Efficiency Ratio (SEER), Energy
   \note Efficiency Ratio (EER), Integrated Energy Efficiency Ratio (IEER), and the Standard
   \note Rating (Net) Cooling Capacity which will be outputs in the EnergyPlus eio file.  This
   \note value is not used for modeling the evaporator fan during simulations.
   \type real
   \units W/(m3/s)
   \minimum 0.0
   \maximum 1250.0
   \default 773.3

You are correct. The E+ idd shows, and code confirms, that the units are W/(m3/s). This input is a power per flow rate input for the fan power used during the rating calculations. This input is not used otherwise.

Coil:Cooling:DX:SingleSpeed,
  N5 , \field Rated Evaporator Fan Power Per Volume Flow Rate
   \note Enter the evaporator fan power per air volume flow rate at the rated test conditions.
   \note The test conditions vary external static pressure based on total cooling capacity.
   \note This value is only used to calculate Seasonal Energy Efficiency Ratio (SEER), Energy
   \note Efficiency Ratio (EER), Integrated Energy Efficiency Ratio (IEER), and the Standard
   \note Rating (Net) Cooling Capacity which will be outputs in the EnergyPlus eio file.  This
   \note value is not used for modeling the evaporator fan during simulations.
   \type real
   \units W/(m3/s)
   \minimum 0.0
   \maximum 1250.0
   \default 773.3

You are correct. The E+ idd shows, and code confirms, that the units are W/(m3/s). This input is a normalized power per flow rate input for the fan power used during the rating calculations. This input is not used otherwise.

Coil:Cooling:DX:SingleSpeed,
  N5 , \field Rated Evaporator Fan Power Per Volume Flow Rate
   \note Enter the evaporator fan power per air volume flow rate at the rated test conditions.
   \note The test conditions vary external static pressure based on total cooling capacity.
   \note This value is only used to calculate Seasonal Energy Efficiency Ratio (SEER), Energy
   \note Efficiency Ratio (EER), Integrated Energy Efficiency Ratio (IEER), and the Standard
   \note Rating (Net) Cooling Capacity which will be outputs in the EnergyPlus eio file.  This
   \note value is not used for modeling the evaporator fan during simulations.
   \type real
   \units W/(m3/s)
   \minimum 0.0
   \maximum 1250.0
   \default 773.3