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Your cat and you can both benefit from incorporating the cat flap inside your bifold door. It can also help prevent extreme cold or hot weather from entering your home. The first step is to measure your pet's measurements to determine the size of the door flap you will require. This will enable you to design an opening for the flap that is the correct size. Outdoor Access While installing a cat flap on an exterior back door is not a job for a novice, those with little DIY skills can usually do it. This will