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A cat flap that is through the wall is a great way to let your pet leave and come whenever they like. But, you should be careful not to install it too high on the wall. This can cause energy loss and allow burglars to gain entry into your home. Additionally, if you're planning to sell your home in the near future and you have an opening in a cavity wall could be an issue for new owners. Glass cat doors are an alternative that is safer. Easy to install A wall-to-wall cat flap is a great way to let your cat come and go at will. It's easy to put up, an