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A double-glazed cat flap allows your pet to go inside and out of the house freely. This can help to reduce stress levels, increase their sense of independence, and encourage exploration and exercise. The pet flap hole can be cut during the manufacturing process and later fitted into new uPVC windows and doors. But, it shouldn't be fitted into existing glass that has been tempered. Cost When deciding to install a cat flap in your double glazing, it's important to think about the cost of installation. The cost of