ProMaster Maxx Fan Adapter
thingiverse
This allows a Maxx Fan to be installed over the ribs in a ProMaster van roof. There is a top/exterior and a bottom/interior. You will need to print two of each piece. The pieces "puzzle" together. You will probably want to print using PETG or ABS to survive the heat of the roof. You would want to use some good sealer to glue and seal everything together so water cannot get in. SEM automotive seam sealer: https://amzn.to/31VwRvl may work well. Use at your own risk . . . I have not tested the outside/exterior of this design.
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