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A cat flap that is through the wall is a great option to allow your pets to move around whenever they like. You must be careful to not install it too high into the wall. This can result in the loss of energy and also allow burglars to gain entry into your home. A gap in a cavity could be a problem for future owners if you plan to sell your home. 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 as it pleases. It is easy to install and there are a variety of models to choose from. Some ev