Air Diffuser Part

Hi… I need to make a 3D-printed part to test an idea for a project in school… The part is basically a splitter for an airduct from a 2″ airduct to 2 X 1″ air ducts.. It should be as small/lightweight as possible, but still be able to conduct heated air from the 2″ to the 1″ ducts… we will use this in class to test the speed of the air before and after the change