https://opensourcebridge.scien....ce/wiki/Cat_Flap_Cov
Cat flaps provide the convenience of letting your pet come and go whenever they want without needing to open the door or window for them. They are available in various materials and can be incorporated into doors, windows and walls. A skilled tradesman can install a cat flap on any kind of door including wood, composite and Upvc. Installation Costs The cost to install the cat flap is different depending on the type, size and complexity of the project. The material of the wall or door can also impact the labor cost. Install