So I bought a small room AC for my 8’ x 12’ office. With one printer going to can be unbearable to work in it while a print is going.
It came with a window vent thingy. That isn’t optimal in my tight space so I have to have a “through the wall” vent adapter for it.
The through the wall bit is done. I need designed a door for it. Now I am onto designing the hinge for the door.
Design needs: It needs to close to keep spiders and what not out (as well as can be expected) with impinging the flow of air. It would be best if it shades the top from rain. It also needs to close with a reasonably small bit of deflection and yet with little friction. And lastly it needs to be made so I can experiment and add weight to help make sure it closes without impeding air flow. For ease of printing It will be an assembly. The pic below shows the orientation. The ribs on the door are to prevent warping and restrict air flow a little less.
The 90 elbow, while nicely done and printed was discarded after I read the instructions (my bad, read them first) where is said “No 90 degree bends”. The blue sketch is where my hinge is being noodled 
If anyone has any ideas feel free to let me know.