I bought two other brands of dog flaps, both large, the largest of the two was only 15 1/5 inches. This one is much more. My dog can actually walk through it. And it was cheaper. It was easy to install. Make sure you have a hacksaw blade that will go through, otherwise you will have to cut one side and then flip and cut the other side like I did. If you have a steel door, be sure to go around any edges you trimmed and sand down any burrs. You'll get better and you won't cut yourself. My cut was too long so I secured the bottom with a 2 x 2 piece. It worked fine. Be sure to tighten all the screws, and then tighten each one a little until they are secure, but don't over tighten or you'll damage the holes. When you have tightened all of the other screws, put a drop of superglue in the screw hole and screw the screw in to cover the threads, and clamp or hold until it becomes snug. I live in Oklahoma so we get high winds. When the wind reaches 30+, it opens. Besides, I love it.
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