https://www.openlearning.com/u..../monraddurham-sm2a2u
uPVC door panels are a long-term solution to composite doors. They are strong energy efficient, durable, and fireproof. They are also reasonably priced 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. This is more secure than cutting a hole into an existing glass panel. UPVC doors are easy to maintain Unlike traditional wooden doors, uPVC doors don't require frequent painting or sanding. They are also
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