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Incorporating a cat flap into your bifold doors can provide many benefits to you and your feline companion. 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 size of door flap is required. This will help you design a cat flap hole that is of the right size. Outdoor Access Even those with minimal DIY skills can install a cat flap on an exterior back door. This will save you the expense and hassle of calling an expert joiner, carpenter or handyman to carry out the job for