https://elearnportal.science/w....iki/Installing_a_upv
uPVC panels are a strong and long-lasting substitute for composite doors. They are strong energy efficient, durable, and fireproof. They are also inexpensive and easy to maintain. A double-glazed sealed unit that has a hole already made for the cat flap is the most convenient way to install 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, uPVC doors don't require frequent painting or sanding. They
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