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A wall-to-wall cat flap is a great method to allow your pets to leave and come whenever they want. Be careful not to put it too high in the wall. This could lead to energy loss and the risk of burglars breaking into your home. A gap in a cavity can also be a problem for future owners if you intend to sell your house. Glass cat doors are a much safer choice. Easy to install A cat flap that is built into the wall allows your cat to come and go whenever it wants. It's easy to put up, and there are several models to choose from. Some even allow you to lock the door, whic