UPVC panels are a durable and long-lasting substitute for composite doors. They are strong, energy efficient, and are resistant to fire. They are also affordable and easy to maintain. The most straightforward way to install a cat flap into a uPVC panel is to order an extra double-glazed sealed unit https://www.repairmywindowsanddoors.co.uk/didcot-cat-flap-installer-near-me/