UPVC panels are a durable and long-lasting substitute for composite doors. They are durable, effective and fireproof. They are also affordable and easy-to-maintain. A double-glazed sealed unit with a hole already made for the cat flap is the most convenient way to install a cat flap in a uPVC sheet. https://window-with-cat-flap41060.blogthisbiz.com/37036155/how-much-does-a-cat-flap-cost