https://wifidb.science/wiki/Fi....t_a_Cat_Flap_in_a_UP
https://chessdatabase.science/....wiki/Back_Door_With_
uPVC door panels are a long-term alternative to composite doors. They are durable, effective and fireproof. They are also inexpensive and easy to maintain. The purchase of a double-glazed, sealed unit that has already cut a hole for the cat flap is the most convenient method of installing the cat flap on a uPVC sheet. This is more secure than cutting a hole through an existing glass panel. UPVC doors are easy to maintain Unlike traditional wooden doors