https://yamcode.com/why-instal....l-a-double-glazing-c
uPVC door panels offer a long-term alternative to composite doors. They are durable, efficient and resistant to fire. In addition, they are inexpensive and easy to maintain. A double-glazed sealed unit with a hole already made for the cat flap is the most convenient method of installing the cat flap on a uPVC sheet. This is much more secure than trying to cut a hole in 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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