Side vent for caravan.
Design for the hole size W440mm x H110mm. (Vent of Elextrolux fridge.)
Three parts and connection with the 5mm or 6mm bolt.
Parts are: left part, middle part, right part. (Whole part is too big for the normal home 3D printers.)
Can use also with two parts.
C-plastic is for the top of the joints.
Vent's smooth surface comes outside of caravan.