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A through wall cat flap is a great way to allow your pets to leave and come as they please. But, you should be careful not to install it too high in the wall. can cause energy loss and burglars to break into your home. A cavity with a hole can also be a problem for future owners if you plan to sell your home. Glass cat doors offer the security of glass. Easy to install A cat flap that is built into the wall allows your cat to come and go when it wants. There are many models