https://wizdomz.wiki/wiki/Cat_....Flap_Installation_in
Cat flaps let your pet leave and come back whenever it wishes. You can opt for a lockable flap to stop other cats and animals from entering your home. You can put an animal flap inside a bifold door as long as the door is made of toughened glass and the frame is not rotten or damaged. The procedure is similar to installing one on the door made of wood or uPVC. Easy to install Adding a cat flap to your bifold doors enables your pet to go in and out of your home without hassle, and without having to open and close the