Âcorresponding to the previous Email... Attached you can find another IDF file. This model has also 2 zone  with approximately same plan, floor area and zone volume. from the point of non-convex definition, the roofs are not convex. However, when I run this file , I do not receive any non-convex warning .Â
if the main cause of "non-convex warning" is related to the shape of the roof, why I am not reported about this problem while I run this IDF file.Would you please consider this file.Â.. Um... Is it very serous to fix the non-convex warning? I mean....,  can I rely of the result of the model simulation if I do not fix this warning? ÂOr, Is it  enough to cut the roofs into convex shape ( not the zone)?ÂThank you so much.Best,Tilak
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