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You and your cat can both benefit from adding a cat flap in your bifold door. It also helps to prevent extreme cold or heat from entering your home. The first step is to measure your pet to determine the size of the door flap you'll require. will enable you to create a hole of the correct size for the cat flap. Outdoor Access Installing a cat flap inside an external back door is not an easy task for the novice, those with minimal DIY experience can usually manage it. This can save you the cost