In the documentation here , infiltration field are described that are included in the Space Types tab, under the Space Infiltration Flow Rates. However, Flow per Exterior Surface Area is not included in the documentation descriptions. I'm looking for the appropriate entry field(s) and Design Flow Rate Calculation Method for inputting .4 cfm/ft2 of exterior wall area as referenced in 90.1 and IECC 2015. Could someone clarify this for me?