https://blogfreely.net/storeda....mage51/cat-flap-inst
uPVC panels are a durable and long-lasting alternative to composite doors. They are strong, durable and resistant to fire. Additionally, they are cost-effective and easy to maintain. A double-glazed sealed unit that has already cut a hole for the cat flap is the simplest way to install a cat flap in a uPVC sheet. This is more secure than cutting 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 energy effi