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A wall-to-wall cat flap is a great way to let your pet leave and come whenever they like. Be careful not to install it too high into the wall. This can result in energy loss and allow burglars to break into your home. A gap in a cavity can be a challenge for future owners if you intend to sell your home. Cat doors made of glass are a safer alternative. Easy to install A through wall cat flap is a great method to allow your cat to move around whenever it wants. There are many models and they're easy to put up