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Double-glazed cat flaps let your pet to move around the house without restriction. This can reduce stress levels, enhance their sense of freedom, and encourage exploration and exercise. It can be put in new uPVC doors and windows, and the pet flap hole is cut during the manufacturing process. However, it should not be installed into existing glass that has been tempered. Cost It is important to take into consideration the cost of installation when deciding whether to install a cat-flap into your double-glazing.