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Incorporating a cat flap into your bifold doors will provide many benefits to you and your pet. It also helps to keep extreme hot 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 need. This will allow you to make a hole that is the correct size for the flap. Outdoor Access While installing a cat flap inside the back of your house is not an easy task for a