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You and your cat will both benefit from incorporating an animal flap into your bifold door. It can also keep extreme hot or cold weather from entering your home. The first step is to measure your pet to determine the size of the door flap you will require. This will allow you to create a hole that is adequate for the cat flap. Outdoor Access The installation of a cat flap in the back of your house is not an easy task for a novice, even those with a little DIY skills can usually do it. This will save you the cost