https://fkwiki.win/wiki/Post:C....at_Flap_Cover_For_Wi
Introduce your cat to the flap prior to when it's installed so they can become familiar with the size and shape. Open the flap and let them explore it from every angle. Ensure the cut-out is even and square. Mark the screw holes on your door and align them with the opening of the cat flap - the distance between the edges should be the same. Preparation Installing a cat flap inside your home can be beneficial to the health and well-being of your pet. is because it lets the pet to move freely between indoors and outside without needi