Geometry preparation for CFD
@NathanielChong asked about how to create a mesh to make a CFD analysis of duct work that circulates air in a lecture theatre.
Nathaniel, you provided an IGES file that has 5,029 individual surfaces.
Instead, create three solids. One for each duct tree and one for the room. You can make just one solid for the duct tree because the other one is a mirror image. The duct tree solid should have faces to indicate inlet and outlet of air.