It is designed to be modifieble in Fusion 360.
To modify it you need to upload f3d file to your account an then change parameters in Modify drop down menu. then you change inlet and outlet dimensions to sout your model and pipe that leads out of AC.
To print it you need to cut in half and use supports.
next you need to glue it, so it is in one piece, then you screw it on pipe and push it in outlet of AC.
The author marked this model as their own original creation.