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You and your cat can both benefit from incorporating the cat flap inside your bifold door. It can also stop extreme cold or heat from entering your home. The first step is to take measurements of your pet to determine the right size door flap is required. This will enable you to create a hole that is the correct size for the flap. Outdoor Access Even those with basic DIY skills can install a cat flap onto an outside back door. This can save you the expense and hassle of contacting an expert joiner, carpenter or handyman to do the job