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Your cat and you can both benefit from adding an animal flap into your bifold door. It can also stop extreme heat or cold weather from entering your home. First, you must measure your pet in order to determine the right size door flap is required. This will allow you to make a hole that is appropriate to fit the cat flap. Outdoor Access Installing a cat flap inside an exterior back door is not an easy task for a novice, those with little DIY experience are usually able to do it. This can save you the cost and hassle of calling