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My comments apply to the dual flap thru-wall style. This dog door has the best flap design for excluding drafts and insects, but loses points because the thru-wall design is a real challenge for a DIY installer. (I'm guessing that the thru-door style is pretty simple to install.) Cutting the wall opening and assembly are straight-forward. The problem is that the inner and outer frames are clamped together through the wall with threaded rods. Requires accurate metal cutting and tight precision in measuring the wall thickness and cutting the threaded rods to length for your wall. If you don't cut the rods to exactly the right length, they're either too long and the nuts can't be tightened or they're too short to engage the nut. And you have to thread them into place blind through the inside frame into holes small the outer frame.
Lapped siding on the outside wall increases the difficulty. I can't imagine installing it with no helper outside to keep things together and lined up. The instructions are fine for assembling the tunnel, but leave much to be desired on the actual installation in the wall. In the end, I got it lined up and secured, but it was a real hair-puller; and I'm a handy guy with tools. I think tradesmen will have some difficulty with installation too unless they've installed one before. It's a robust design with a tight seal, but they should find a less frustrating method for securing the inner and outer frames in the wall.
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