https://sciencewiki.science/wi....ki/Cat_Flap_Installa
A upvc door panel cat flap is a great option to allow your cats to leave and come at their own pace. It's a simple three-step installation procedure and can be incorporated 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 money on energy. UPVC panels are strong and can resist moisture, heat and UV. Easy to install If you have a cat you may want to consider installing a pet flap in your glass door or window. This is a great method to ensure y