https://elearnportal.science/w....iki/Why_Install_a_Do
A cat flap for a door made of UPVC is an excellent way to allow your pets to come and go as they please. It is a simple 3-step installation procedure that can be fitted into wooden doors, glass doors, or UPVC panels. This is an excellent option for those who want to ensure their pets are secure and save on energy costs. UPVC panels can resist moisture, heat, and UV. Easy to install Installing onto your glass door or glass panel is an excellent idea if you have a kitty. This is a great method to keep your pet safe w