Well, still no luck so far....
On the bright side, it fits a box fan PERFECTLY! Nice for when I have electrical
Maybe I'll try to improvise a 12v fan in a box frame (with bug netting) for those clear days/nights. I'll just waterproof the plywood temporary top.
Let me know if anybody has a good idea.
Up till now I thought the MKP had the bigest vent opening at 18"x18" and I didn't think it was possible to find anything bigger than 14".
Thanks for the name (egress vent) and the tip!!
Good luck, Mark with your search!