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Cat flaps allow your pet to move around 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 door is possible as long as the door frame is made of toughened glass. The frame should not be damaged or rotten. The process is largely the same as installing a cat flap in a wooden or uPVC door. Easy to install Adding a cat flap to your bifold doors will allow your pet to go in and out of the house easily, without needing to open and close the door