UPVC panels are a strong and long-lasting alternative to composite doors. They are durable, efficient and fireproof. They are also affordable and easy to maintain. The most straightforward way to install an animal flap on a uPVC panel is to buy an additional double-glazed sealed unit with a pre-cut hole https://www.repairmywindowsanddoors.co.uk/ewell-cat-flap-installer-near-me/