This calculator may be used by LEED 2009 projects to complete the ASHRAE ventilation rate procedure. The 62MZCalc spreadsheet is available as part of the Standard 62.1-2007 user manual. Additional instructions for LEED for Existing Buildings: O&M projects
Note: The Minimum Indoor Air Quality Performance Calculator
released by USGBC in 2014 is another calculator that may be used by LEED 2009 or LEED v4 projects for the ASHRAE ventilation rate procedure calculations.