eQuest fan/exhaust static pressure units

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You could try following the advice here to use a text editor to edit the text in your inp file.

I think you will still not be able to edit your value from the graphical user interface outside the allowable ranges. But you can edit your .inp file (open in a text editor and search for the keyword "SUPPLY-STATIC"), save the file and reopen it in eQuest.

I think it will then simulate with your out of allowed range value. You should confirm, by producing an hourly report on the system fan power, that the fan power result is really as you expect.

Interesting project. Alternatively, you could try using the peak of 15 inches w.c. and adjusting fan system efficiency downwards to achieve the correct full-load fan power.

The eQuest interface enforces the DOE2.2 limits on various inputs. You can try using DIAGNOSTIC NO-LIMITS ..

But even that workaround is not enough for some inputs. @Daniel's comment about lowering the fan efficiency to achieve the desired fan kW is likely the best alternative.