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Incorporating a cat flap into your bifold doors can offer many benefits to you and your cat. It can also stop extreme heat or cold weather from entering your home. The first step is to measure your pet's size to determine the size of the door flap you will require. This will enable you to design a cat flap hole that is the right 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 cost