https://pattern-wiki.win/wiki/....Cat_Flap_Installatio
A cat flap that is built into the wall lets your pets come in and out whenever they like. However, you should be careful not to install it too high in the wall. This can cause energy loss and burglars to enter your home. If you are planning to sell your home in the future having a hole in a cavity wall could be an issue for the new owners. Glass cat doors are a safer alternative. Easy to install A wall-to-wall cat flap lets your cat to come or go when it wants. There are a variety of models available an