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Cat flaps let your pet come and go whenever it wishes. You can opt for a lockable flap to stop other cats and animals from entering your home. Installing a cat flap on a bifolding door is possible as long as the door frame is made of toughened glass. The frame should not be rotten or damaged. The process is largely the same as installing a cat flap in a wooden or uPVC door. Easy to install Install a cat flap on your bifold door, allowing your pet to go in