https://squareblogs.net/chestl....ip4/using-upvc-cat-f
uPVC door panels offer an alternative for composite doors. They are strong, energy efficient, and are resistant to fire. They are also reasonably priced and easy-to-maintain. The most straightforward way to install an animal flap on a uPVC panel is to purchase an extra double-glazed sealed unit with a pre-cut hole for the flap. 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. The
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