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Integrating a cat flap in your bifold doors can offer many benefits to you and your feline companion. It can also prevent extreme heat or cold from entering your home. First, you need to take measurements of your pet to determine the size of door flap you need. 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 onto an external back door. This will save you the cost and hassle of calling a carpenter, joiner or handyman to complete the task for you. I