The last couple of nights both Mrs. Fatshot and I have heard noises in the attic, so I went up there today and saw obvious signs that some kind of critter had gotten in and was chewing up boxes, etc. A little investigating showed that the piece of screening protecting the open attic vents had been chewed away. So, I measured up the opening, built a wooden frame that would fit in there, and attached screening to both sides with the staple gun. Slid it in
the opening and shimmed it up so it fits good and snug. Hope it does the trick.....will know in a day or so....