The file 'Elegoo Saturn Vent 4″ Attachment For 4in Duct 3D Printer Model' is (stl) file type, size is 953.8KB.
Remix of wildcardfox's Saturn vent duct adapter to work with 4" ducting instead of 6"
6mmx2mm magnet holes added for attachment or just tape it on.
Tested and works well on my machine.