(Continuing my prior post.? This website has gone whacko on me.? If I type a message bigger than the text box, it won't scroll to the end of thd message without great difficulty)
An additional thing to do for fan installation is hunt down the location where the power is on only when the fridge is on.? That way when you shut the fridge off the fan goes off too.
Another thing some do is put a thermocouple on the power wire.? This makes the fan only come on if the temp in that area exceeds what opens the thermocouple.? But this mod is overrated IMO.? My original fridge had a thermocouple that never shut the fan off, and my new fridge has a thermocouple that almost never turns the fan on.
Another mod to make handling of the upper fridge vent easier is to make the fan connected by some small spade connectors, so you can remove the vent and set it aside.? If you do that, use insulated spade connectors, and put the female connector on the live (+) power wire connected to the battery, so it can't touch a ground and blow the inline fuse.