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A cat flap that is built into the wall allows your pets to come out and in whenever they want. You must be careful not to put it too high into the wall. This could lead to energy loss and also the possibility of burglars gaining access to your home. A gap in a cavity can be a challenge for future owners if you plan to sell your house. Glass cat doors are a safer option. Easy to install A cat flap that is built into the wall allows your cat to come or go whenever it wants. There are numerous models a