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A cat flap that is through the wall is a great way to let your pets leave and come as they please. Be sure not to put it too high in the wall. This could lead to energy loss and the risk of burglars breaking into your home. A gap in a cavity could be a problem for future owners if you plan to sell your house. Glass cat doors offer the security of glass. Easy to install A cat flap that is built into the wall is a great way to allow your cat to move around as it pleases. There are numerous models available and