Originally Posted by DHart
We have had similar experiences with our Dometic when in hot climates.
If you would, please share more info about the fans, where they are from, how they are mounted, that kind of thing.
Photo 1 shows the open fridge vent with the hole for installing the fan switch. I installed the aluminum to make sure that the switch would be securely mounted. The aluminum was glued to the inside of the fiberglass chimney using epoxy glue. The duct tape was used to hold the sheet aluminum in place until the glue dried.
Photo 2 shows the cardboard footprint of the vent opening. I made the bracket to match the cardboard cutout. I used an oscillating saw to cut the aluminum angle so that the flat section left could be shaped to follow the round section on the inside. I used a short piece of 3" pvc pipe to make the round shape.
The cut outs made in the original post photo of the aluminum bracket were made using a jig saw. The cut outs had to match the inside diameter of the fan housing.
The third photo shows the wired switch ready to be installed in the fridge vent. It is a lighted switch that only lights up when the fans are operating. This is probably not really necessary as you can hear the fans running, although the sound is not very loud.
After I installed the vent fan assembly in the chimney I caulked all joints and gaps to make sure there was not any leakage around the edges. This can be seen in the original post photo. Note that the brown wire at the top on the left side is only to help me install a wire when I install my solar panels and need to run the wire from the panels on top of the roof to the charge controller in the interior of the Airstream.
The last photo shows the vent cap installed.
This was not an easy project for me because I had never done this before. I believe it turned out well. I can't think of anything I would do differently if I did it again. I am sure that it would go much faster and the finished product would look better, but would not work any better.
Let me know if you have any questions or need any help if you decide to make a chimney vent fan system. I will help all I can.
I will run a test when the weather heats up.