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Cat flaps let your pet leave and come back whenever it wants. You can choose a locking flap to keep other cats and animals from entering your home. Installing a cat flap to a bifolding doors is possible as long as the door frame is made from toughened glass. The frame should not be rotten or damaged. It's the same as installing one on an old wooden door or uPVC. Easy to install The addition of a cat flap to your bifold doors will allow your pet to move in and out of your home easily, without needing to open o