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You and your cat will both benefit from having the cat flap inside your bifold door. It can also prevent extreme cold or heat from entering your home. The first step is to measure your pet's size 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 inside an external back door is not a job for the novice, those with a little DIY experience can usually manage it. This can help you avoid the expense and ha