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You and your cat will both benefit from adding an animal flap into your bifold door. It also helps to keep extreme hot or cold weather from entering your home. First, you need to take measurements of your pet to determine what size door flap is needed. This will allow you create an opening for the flap that is the correct size. Outdoor Access Even those with basic DIY skills can manage to install a cat flap to an external backdoor. This will save you the expense and hassle of contacting a carpenter, joiner or handyman to carry