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Integrating a cat flap in your bifold doors can offer many benefits to you and your pet. It can also help stop extreme heat or cold weather from entering your home. First, you need to measure your pet in order to determine the right size door flap is required. This will allow you to make a hole that is adequate for the flap. Outdoor Access Installing a cat flap in the back of your house is not a job for a novice, even those with little DIY experience are usually able to do it. This can help you avoid the cost and hassle of calling in an exper