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You and your cat can both benefit from adding an animal flap into your bifold door. It also helps to prevent extreme cold or heat from entering your home. The first step is to measure your pet's measurements to determine the size of the flap you'll require. This will enable you to create a hole of the correct size to fit the cat flap. Outdoor Access Even those with no DIY skills can manage to install a cat flap on an external back door. This can help you avoid the expense and hassle of calling in a carpenter, joiner or handy