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Cat flaps are an excellent way to let your pet come and go whenever it wants. You can opt for a lockable flap to stop other animals and cats from entering your home. It is possible to install an animal flap inside bifold doors, so long as the door is composed of toughened glass and the frame is not damaged or rotten. The process is similar to installing a cat flap on an old wooden door or uPVC. Easy to install Adding a cat flap