To whom it may concern,

I believe there is an issue with the v2009v4v4.1_Minimum_IAQ_Performance_Calculator_v04.xlsm "Summary" Tab.

When I fill out the required info for the Air systems tabs (my project has 100% outdoor air systems) and then click 'Refresh Systems' in the "Summary" tab, the sheet does not produce any results. Also, every time the 'Refresh Systems' button is pressed, mulitple rows appear saying 'MultipleZone Systems' and '100% Outdoor Air Systems' with NO RESULTS.

Can you please advise on what may be the issue?

We have tried on many PCs in our office with no conclusion...