https://menwiki.men/wiki/The_Benefits_of_Cat_Flaps
Cat flaps are an excellent way to allow your pet to move around at their own pace. You can also opt for a locking cat flap to stop other animals and cats from gaining access to your home. Installing a cat flap to the bifolding door is feasible, provided the panel is made from toughened glass. The frame must not be rotten or damaged. It's the same as installing one on the door made of wood or uPVC. Easy to install Install a cat flap onto your bifold door to allow your pet to go in and out of the house without you having to open or close