Section 27.4.7 limits the minimum design wind load to 16 lb/ft² for both enclosed and partially enclosed buildings. This is enforced in the implementation.

You can select the Do not Consider Minimum Design Wind Loads for ASCE 7-10 (Errata Section 27.1.5) option in the ASCE 7-10 Wind dialog to suppress consideration of the 16 psf minimum wind pressure given in Errata Section 27.1.5. For member design this option should not be selected, but in the investigation of wind drift some engineers use wind loads with a short recurrence interval in which case it may be desirable to suppress consideration of that minimum wind pressure.