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Double-glazed cat flaps let your pet to enter and exit the home without restriction. This can reduce anxiety, boost their sense of freedom and encourage exploration and activity. 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 into existing tempered glasses. Cost It is important to consider the cost of installation when deciding whether to install a cat-flap into your double glazing. The cost of installation