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You and your cat will both benefit from incorporating an animal flap into your bifold door. It can also prevent extreme cold or heat from entering your home. The first step is to measure your pet to determine the size of the flap you will require. This will enable you to design an opening for the flap that is of the right size. Outdoor Access Installing a cat flap on an external back door isn't a task for a novice, even those with little DIY experience are usually able to do it. This will save you the expense and hassle o