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Integrating a cat flap in your bifold doors can provide many benefits for you and your cat. It can also keep extreme hot or cold weather from entering your home. The first step is to measure your pet's measurements to determine the size of the door flap you'll need. This will enable you to design a cat flap hole that is the correct size. Outdoor Access Installing a cat flap on an external back door is not an easy task for a novice, those with little DIY experience can usually manage it.