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Your cat and you can both benefit from adding an animal flap into your bifold door. It can also prevent extreme cold or heat from entering your home. The first step is to measure your pet in order to determine the right size door flap you need. This will enable you to create a hole of adequate for the cat flap. Outdoor Access Even those with no DIY skills can install a cat flap on an outside backdoor. This will save you the expense and headache o