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Cat flaps are a great option to let your pet come and go whenever it wants. You can also opt for a cat flap that locks to prevent other cats and animals from gaining access to your home. You can install a cat flap in bifold doors, so long as the door is composed of toughened glass and the frame is not rotten or damaged. The procedure is the same as installing one in an wooden or uPVC door. Easy to install Install a cat flap onto your bifold door, allowing your pet to exit and enter the house without needing to open or close the