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Cat flaps allow your pet to move around whenever it wants. You can also choose a cat flap that locks to prevent other cats and animals from gaining access to your home. You can put the cat flap on a bifold door as it is constructed of toughened glass and the frame isn't damaged or rotten. It's the same as installing a cat flap on an old wooden door or uPVC. Easy to install The addition of a cat flap to your bifold doors enables your pet to go in and out of the home without hassle, and without needing to open or close the doo