Well, I am keeping the insulation off anyway. I am going to get a piece of
magnetic sign material. The kind that may be 1.5 ft X 2.5 ft in size. Like
people use to advertise on the side of their vehicle. I will apply this
material with a bit of 1/2 inch thick insulation foam under it,  over the
outside area adjacent to the frig.This during summer daytime. If I park, I
will park so the sun is not shining on the frig area.I removed all the
insulation in this area, and the fiber board too. The air in this area is
rather trapped, and will hang out there till it is blown outside. This
willgive it a chance to passively conduct through the van wall. One
question about your vent installation-How do you keep the door from blowing
off while driving. I haved lost several utility box doors this way.Please
send pictures of your fan. Roger