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You and your cat can both benefit from adding a cat flap in your bifold door. It can also stop extreme heat or cold from entering your home. The first step is to measure your pet to determine the size of the flap you'll require. This will allow you to make a hole that is the correct size for the cat flap. Outdoor Access Installing a cat flap in the back of your house is not an easy task for a novice, those with a little DIY experience can usually manage it. This will help you avoid the cost and hassle of hiring a car