The Petsafe Wall Kit for their Electronic Smart Door
simplifies installation of the Smart Door in a wall from 3 3/4" to 7" thick. The large extension increases the thickness range by 2" for the large size only.
Not only simplifies installation; Petsafe confirms that this wall kits is mandatory for wall installations or the Smart Door won't work.
Any time you install a dog door in a wall, it's vital that the wall be "framed out" and caulked so that no water or debris can find it's way inside your wall. Very serious problems like dry rot, mold and insect infestation can result from inattention to this point.
If you have the skills to frame the wall yourself, that's fine and you can install any pet door you like in your wall. However, even for the highly skilled, it's easier to use a wall kit provided by the dog door company if they make one. Petsafe does for their "Smart Door".
These wall kits are considerably more sophisticated--and expensive--than usual. Instead of a simple pre-fabricated tunnel in four sections, Petsafe has chosen to mold their tunnel kits which is a very expensive approach. The resulting kits are, however, very nice and easy to use. In addition, they have fewer seams to worry about than the more common approach. If you want an electronic dog door in a wall, we think this is a great approach.
Petsafe products may not be shipped outside the USA.