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Were you using a different fan object before and seeing fan electric power values > 0 in the Sizing Report Summary?

It looks like it there are air flow rates being sized in the column to the left of the one circled in your screen shot. This makes me think that EnergyPlus is calculating fan flow needs, but that the fan isn't turning on during the design day. Check the Office HVAC On (ASHRAE) schedule referenced by the Availability Schedule Name input field and make sure that the "WinterDesignDay" and "SummerDesignDay" day types defined in the schedule are not 0 all day. If these day types are NOT defined in the schedule, then EnergyPlus will automatically assign 0 all day, and you would see lines similar to below in your error file ending in *.err generated by EnergyPlus.

** Warning ** ProcessScheduleInput: Schedule:Compact="LOFF ELEC INTLIGHT SCHEDULE" has missing  day types in Through=12/31
**   ~~~   ** Last "For" field=FOR: SUNDAY HOLIDAY
**   ~~~   ** Missing day types="SummerDesignDay","WinterDesignDay","CustomDay1","CustomDay2"
**   ~~~   ** Missing day types will have 0.0 as Schedule Values