https://www.openlearning.com/u..../lindseyjamison-smif
https://squareblogs.net/cougar....thing3/cat-flap-glas
Double glazing can be equipped with flaps for dogs and cats to let your pet go and go whenever they want. They also help keep your pet's attention when you are away. It is possible to install the cat flap inside an existing uPVC or double glazing sealed unit. However, you'll require a replacement part that has an opening already made. This can be accomplished by a glazier equipped with the appropriate equipment and experience. E
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