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A wall-to-wall cat flap is a great option to let your pets come and go whenever they want. But, you should be careful not to place it too high in the wall. This could result in the loss of energy and also allow burglars to enter your home. A gap in a cavity can also be a problem for future owners should you decide to sell your home. Glass cat doors are a safer alternative. Easy to install A cat flap that is built into the wall allows your cat to come and go as it pleases. It's easy to put up and there are a variety of models to choose from. Some models al