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Double glazing cat flaps allow your pet to move around the home without restriction. This can help to reduce stress levels, increase their sense of freedom, and encourage exercise and exploration. The pet flap hole can be cut during the manufacturing process and later fitted into new uPVC doors and windows. It should not be installed in existing glassware that is tempered. When you decide to install a cat flap in your double-glazed windows, you need to think about the cost of installation.