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You and your cat will both benefit from having 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's measurements to determine the size of the door flap you'll require. This will help you make 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 exterior backdoor. This will save you the expense and hassle of hiring a carpenter or handyman to do the