Natural ventilation calculations

You are correct for LEEDv2009 Natural Ventilation compliance was shown by completing Table L-17. Natural Ventilation AHU Summary within the IEQp1 Form; these calculations were not included in the 62MZCalc spreadsheet. Unfortunately, with the new LEED Minimum Indoor Air Quality Performance Calculator (for v2009 or v4 projects) natural ventilation is still not included in the spreadsheet. For v4 projects complying with natural ventilation, the IEQ form does not provide a table for calculations and the project team must provide/upload external calculations that prove compliance. For naturally ventilated spaces (and for mixed-mode systems when the mechanical ventilation is inactivated), determine the minimum outdoor air opening and space configuration requirements using the natural ventilation procedure from ASHRAE Standard 62.1–2010 or a local equivalent, whichever is more stringent.