https://chessdatabase.science/....wiki/Choosing_Cat_Fl
uPVC panels are a strong and long-lasting substitute for composite doors. They are durable energy efficient, durable, and fireproof. They are also inexpensive and easy to maintain. Ordering a double-glazed sealed unit with a hole already made for the cat flap is the most convenient method of installing an animal flap inside a uPVC sheet. This is more secure than cutting a hole in an existing glass panel. UPVC doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sanding.