https://funsilo.date/wiki/Window_With_Cat_Flap
https://pattern-wiki.win/wiki/Cat_Flap_Fitters
A cat flap made of UPVC is a great option to let your cat leave and come at their own pace. It is a straightforward 3-step installation procedure that can be installed on wooden doors, glass doors, or UPVC panels. It is a great choice for those who want to ensure their pets are safe and also save money on energy. UPVC panels are durable and can resist heat, moisture and UV. Easy to install If you have a cat, you might want to consider installing a pet flap inside your door or glass panel