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Cat flaps let your pet leave and come back whenever it wishes. You can also choose a locking cat flap to keep other cats and animals from gaining access to your home. Installing a cat flap to a bifolding door is possible, provided the panel is made of toughened glass. The frame should not be damaged or rotten. The procedure is the same as installing one in a wooden or uPVC door. Easy to install Add a cat flap on your bifold door to allow your pet to exit and enter the house without having to open or shut the door.