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A cat flap that is built into the wall lets your pets come in and out whenever they like. However, you must be careful not to install it too high on the wall. This can cause energy loss and allow burglars to break into your home. A hole in a cavity can be a challenge for future owners should you decide to sell your house. Glass cat doors are a safer alternative. Easy to install A wall-to-wall cat flap lets your cat to come or go whenever it wants. There are a variety of models available and they're easy to install. Ce