https://opensourcebridge.scien....ce/wiki/Back_Door_Wi
https://pediascape.science/wik....i/Window_With_Cat_Fl
Introduce your cat to the flap before it's put in place so that they become familiar with the size and shape. The flap should be opened and let them explore it from all angles. Make sure that the cut-out is even and square. Mark the screw holes on the door and align them with the opening of the cat flap - the distance between the edges must be equal. Preparation Installing a cat-proof flap in your home can be beneficial to the well-being and health of your pet