https://securityholes.science/wiki/Adding_a_Cat_Flap_to_Your_Bifold_Doors Installing a cat flap might appear daunting but it's easy to do by following the correct instructions. Find out how high you'd like your cat flap to be (normally it's located at belly height). Mark this point on the door and then use the template provided as a guideline to drill. If you have a kitten who is still a baby then gently prop the door slightly open and allow it to walk through. Reward it when it goes through. Take a measurement of the door A cat flap lets your pet to go in and out of your home at the time that is convenient for you. This will keep your cat healthy as it will ensure it is getting enough exercise and also be able to return inside if it gets trapped outside in bad weather. It also can reduce the amount of time you'll have to allow it out or in and will also help protect your home by letting you know when it's been out. It is important to make sure that the cat flap is installed correctly in order to prevent your pet from being forced through through it by other animals (e.g. dogs). It is important to measure the height of your pet's belly as well as the doorway to your home to ensure that the flap is at the correct height. If your cat is larger or shorter than the average, you can adjust the position of the flap by moving it up or down by a tiny amount. The next step is to use a spirit level to mark the center of the door that you will put the flap. Then, using the marks as an indication, cut out the contour of your flap on the door with a Jigsaw. Once you've cut the area, sand the edges of the door to smooth the surfaces. Then drill any fixing holes that are needed. The installation of a cat flap should not take more than two hours. However, the process may be slightly more complicated if you need to fit it inside the frame of a uPVC or composite door because these doors come with a wide range of thicknesses, which affect how the holes are cut and what they are fixed