This is a really well designed basic cat door. I ordered a 2nd one 🙂

It has a soft flap that doesn't catch on our cats tail and is very quiet. It also comes with a solid flap you slide into the front if you want to keep your cat from going out. We have no need for it though. The door easy to install. The solid flap slide is used as the template for cutting the hole out. This works out a lot better than a diagram on paper, it's rigid and easy to trace around. It's not weatherproof, I assume it was designed for indoor use only. We installed it on a 6 panel door and it has some high low points where air can pass through, very minute( 1mm or less). Our door has a wood grain texture so it would never be flush anyways. We intend on using some silicone caulking eventually but it keeps odors and tracking at bay just as is 🙂

The flap is kept in place by a magnet that's hidden the frame on the bottom. This leaves a very neat appearance and keeps the flap taut. It did take our cats a few tries to figure out they could push through it. We used a feather toy to get them to run though it a few times as a training lesson.

As a result they now have easy access to a litter box, the Cat Genie ~CatGenie 120 Self-Washing Self-Flushing Cat Box~,in a recluse location in our home 🙂

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p.s. I noticed the dimensions aren't listed on Amazon.
The flap size is 5"x7" (12.7cm x 23 cm) printed on the box and states the telescoping frame adjusts to fit 1 1/4" to 2" door thickness and uses an ABS frame. Made in Thailand.

Our cats' litter boxes are kept in the office room closet. We wanted a way to keep the door closed (keep the stink in) where they could still go in and out. This cat flap is the perfect solution. It was very simple to install (hardest part was just cutting a hole in the door!) and it really does trap the odor inside. Depending on the type of door you own, it may or may not still leak air through... the fit on ours is pretty tight though.

I'd recommend introducing the new door/flap to your cat in steps. We kept the flap off for the first few days and let the cats get used to jumping through just the hole. Once we installed the flap, I took turns putting each cat inside the litter box room and opening the flap a little to show them they could push through it to get out. They were extremely hesitant at first... the magnet at the bottom is heavy and snaps back into place very easily, so I think they were nervous it would catch a paw or tail. But after several times of making it through safely, their confidence returned and they now use it with no problem.

As to the size of the door, my cats are both about 9 pounds and fit easily through. Unless you have a very heavyset cat, the Small should be fine.

The soft flap is very clear, and the magnets at the bottom work well and you get as good of air blockage around the flap as you're going to get with anything. The thing is there is this solid panel you can drop into place to block it. Well the plastic tabs in the frame to hold that panel have holes behind them which is a place for air to get through. Also the screw holes are slightly raised on the back so the whole frame doesn't sit tight against the wall or door. It's not a lot of air that's going to come through but it certainly wasn't well designed for blocking cold air.