[DaveWM]

They seem to be all over the place, but most run hotter than I like. I have never had one that was under 100f after a long run like 1 hour or more.

I just got back from the surplus store. here is what I cobbled together, starting with some 1.5" ID foam pipe (used for insulation) I taped the seam, then using a soldering gun I melted out a square shape at the top so the square muffin would sit down into the pipe, the ID of the fan was about the same for a smooth transistion thru the duct. this is the top the fan will sit outside the fan cage. near the bottom of the pipe I cut a rounded slot that fits loosely over the tire, with enough room to allow the air to come out and flow over the tire. On the bottom I fashioned a foam plug that seals the bottom and conforms to the same cut out. With hindsight would have just fille it with some foam and then used the solder gun to cut the slot on the bottom, but it should work well enough to see if the idea has any merit.

I have the fan running on a 9v battery (12vdc rated fan), its much smaller and less air than the larger muffin that I was using before, but will see if it works or not soon Oz is on now will run for about 30 min and check.

this requres no mods to the cage but for a new top with a hole cut in it for the pipe and an outlet hole. since the top is swung open completly right now I will test it again with the fan/pipe out and the top wide open to see how much is fan and how much is just the open top.