The screen would be 4 inches long and the zippers would be outside the opening and only the center zipper would be functional. You wouldn't be able to unzip it from inside the garage
The screen is as sturdy as a typical window screen and will secure most pets but an aggressive animal may be able to break through it.
My Grandson installed ours. He had the screen up and functioning in no one. We love it. We have a TV out there and now we sit out there in evenings. No Bugs
Yes, it was easy to install and it works fine. I highly recommend this product. Works really well.
It comes with a self adhering Velcro strip and has Velcro on the screen. I still nailed mine in place, but it might not need it.
Yes, if you install the rope pulls and roll up the screen.