View attachment 4603710
The rectangles are proposed fan locations
ok so how about this. If you cant put it vertically on the wall maybe a table to at least bring it up to the level of the hole. you could then maybe run the vent out a little behind the tent and then up and into the tent
does it have a high vent sock somewhere? It looks like it is just sitting up there.
If you don't feel like moving the fan, start with changing the intake duct to a larger size and making the duct have smooth bends, and a straight forward duct path
you could also try putting the fan on the top of the tent with this situation but it would be the same as having the bends really close to where you have the fan right now, it would just be on top of the tent at that point