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After my lunch this afternoon, I opened up System Builder and loaded my project that I was working on this morning and selected floor 4 of my building. The ductwork appeared for a split second then it vanished. After further investigation thinking this…

Hi I am using system builder within Hevacomp to size a variety of services and am running into problems regarding the ductwork. I have selected a default grille type for both supply and extract systems, placed them in the desired rooms and connected…