https://historydb.date/wiki/Ca....t_Flaps_For_French_D
A double-glazed cat flap lets your pet to move in and out of your home without restriction. This can help reduce anxiety, boost their sense of freedom and encourage active play and exploration. The pet flap hole is cut during manufacturing and then installed in new uPVC doors and windows. However, it shouldn't be installed into existing glass that is tempered. Cost It's important to take into consideration the installation cost when deciding whether to install a cat-flap in your double-glazing. It will depend on the kind of door yo