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You and your cat will both benefit from having the cat flap inside your bifold door. It also helps to prevent extreme cold or hot weather from entering your home. The first step is to measure your pet to determine the size of the door flap you'll need. This will allow you to make a hole that is appropriate to fit the cat flap. Outdoor Access Even those with minimal DIY skills can install a cat flap to an exterior backdoor. This can save you the c