https://sciencewiki.science/wi....ki/Cat_Flap_Installa
A cat flap made of UPVC is an excellent way to let your cat leave and come as they please. It's a simple three-step installation procedure that can be installed on glass doors, wooden doors or UPVC panels. This is an excellent option for those who want to secure their pets and reduce energy costs. UPVC panels are resistant to moisture, heat, and UV. Easy to install Installing a pet flap over your glass door or window is an excellent idea if you have a cat. This is a great option to keep your pet secu