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A wall-to-wall cat flap is a great way to let your pet move around whenever they like. However, you should be careful not to place it too high in the wall. This could result in energy loss and burglars to break into your home. Additionally, if you're planning to sell your house in the future, having a hole in a cavity wall could pose an issue for the new owners. Cat doors made of glass are the security of glass. Easy to install A cat flap that is built into the wall allows your cat to come and go whenever it wants.