https://yamcode.com/choosing-c....at-flap-insulation-5
Introduce your cat to the flap prior to when it's put in place so that they become familiar with the size and shape. Prop the flap open and let them explore it from all angles. Make sure the cutout is even and square. Mark the screw holes on your door and align them with the cat flap opening The distance between the edges should be equal. Preparation Installing a cat flap inside your home is beneficial for the well-being and health of your pet. This is because it lets them to freely move between the indoors and outdoors without needin