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Your cat and you can both benefit from having an animal flap into your bifold door. It can also prevent extreme cold or heat from entering your home. The first step is to take measurements of your pet to determine the size of door flap is needed. This will allow you create a cat flap hole that is the correct size. Outdoor Access The installation of a cat flap on the back of your house is not an easy task for the novice, those with minimal DIY experience can usually manage it. This can help you avoid the expense and hassle