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Cat flaps let you allow your cat to enter and out of the home without opening the front door. You can program them to let your cat out only at certain times. This is useful for those who don't want their pet to become stressed. A cat flap can increase your home's energy efficiency as well as security. However, installing one can be costly if don't know what to look for. Cost of the flap Installing a cat flap is a good idea for those who have an animal friend. Th