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You and your cat will both benefit from incorporating a cat flap in your bifold door. It can also help 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 flap you will need. This will help you design a cat flap hole that is the right size. Outdoor Access Installing a cat flap in the back of your house is not an easy task for the novice, those with