https://botdb.win/wiki/Fitting_a_Cat_Flap
https://fakenews.win/wiki/Cat_....Flap_Installation_in
A cat flap that is through the wall is a great option to allow your pets to move around whenever they want. However, you must be cautious not to put it too high in the wall. This could lead to energy loss and the risk of burglars entering your home. Also, if you are planning to sell your house in the future, having a hole in a cavity wall could pose an issue for the new owners. Glass cat doors are a safer choice. Easy to install A cat flap that is built into the wall a