This was frustrating. It was a window, but is now instead, just a piece of wood that also is where the dryer vent goes out, the power to the A/C is there, and there are other things that I don’t know what they are as well. So that’s obviously not a good energy situation. So, with the original intention of just adding a new dryer line–I ended up also “engineering” this additional cover to create another buffer zone. Made me at least glad to have a jigsaw. It took several tries, and lots of walks back and forth to the garage, but it’s pretty close now. Just have to get the dryer line going all the way out to the vent…and hopefully can get it sealed properly when the Tranum Insulation folks come.