https://wifidb.science/wiki/Ca....t_Flap_Double_Glazin
Cat flaps let your pet go in and out at their own pace, without needing to open a gate or window. They are available in a variety of materials and can be incorporated into windows, doors and walls. A professional tradesman is able to install a cat flap for any kind of door, including wood, composite and uPVC. Installation Costs The cost of installing a cat flap can vary greatly based on the size, kind and complexity of the project. It is also crucial to consider the material of the wall or door because this could impact labour costs.