https://funsilo.date/wiki/Repl....acement_UPVC_Door_Pa
https://aiwins.wiki/wiki/Fit_a...._Cat_Flap_in_a_UPVC_
A cat flap is a tiny door that allows your pet to enter and leave the house whenever they want. It can be put in windows, doors and even walls. It opens when your cat pushes an area of their body through it. Microchip cat flaps can recognize your cat's unique microchip and unlock the door. Infrared and magnet flaps require that your cat wear a collar equipped with an infrared or magnet device to activate them. What is a cat flap? A cat flap is a openin