https://pediascape.science/wik....i/Using_uPVC_Cat_Fla
The process of installing a cat flap may be a bit daunting but it's easy to do with the right instructions. Find out how high you'd like the flap to be (normally, it is at belly height). Then, mark this area on the door and use the template included as a reference to drill. If you have a kitten that is still a newborn then gently prop the door slightly open and encourage it to walk through. Reward the kitten each time it moves through. Take a measurement of the door A cat flap lets your pet to move into and out of your hom