Was your house renovated? Could be old ducting that they just reused instead of removing.
It was built in 2016, but maybe they made some initial mistake. Hopefully that's not it.
I’ll be honest, I’m having a hard time visualizing what the heck is going on in these pictures.
The hood should have some sort of vent to the outside of the home. Do you have that?
My hood just goes straight out of the house.
Yeah, I tried naming the files to help, but then Google Photos doesn't make it easy to see those.
The first picture is the vent outside. Essentially, the hood fan (inside) exhausts into the top of the metal box that's in the wall. On the other side of that box, around the middle, is a vent that goes outside. Then there's just a dead-end area of the metal box where some bugs have collected.
+---------------------------------+
| (Hood fan blows in here |
| from inside house ) |
| |
| |
| (Vent to outside house) |
| |
| |
| (Bugs) |
+---------------------------------+
Are you able to to sketch this out on a piece of paper?
Home Improvement