I like that it has one substantial saloon style door rather than two flexible plastic doors for inside and outside the wall installation. Also, it appeared to be ruggedly constructed. If you're cutting a hole in the wall, it needs to hold up.
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They have hinges, like a door, so there's no loud flap slap or flexible materials. They lock easily, and most models come with a steel security plate for additional security when you are away.
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