This is parts for 110x55mm rectangle ventilation tubes. Orientation for print will depend on printer and you may have to experiment with support.
Here is an example of a duct angled 45 degrees for better print result for overhangs.
See other 110x55mm parts https://www.printables.com/model/662010-rectangle-ventilation-110x55mm-parts
And a 90 degree horizontal to verticla twist module https://www.printables.com/model/859085-rectangle-ventilation-110x55mm-90-degree-twist
See also other 100mm and 110x55mm ventilation parts in the collection Ventilation.
The author marked this model as their own original creation.