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Cat flaps provide a way to allow your cat inside and out without needing to open the door. You can program them to allow your cat to go out at certain times. This can be beneficial for those who want to stop your pet from being stressed. A cat flap can increase your home's energy efficiency as well as security. Installing one can be costly when you don't know what to look for. Cost of the flap Installing the cat flap is a great idea if you own pets. This will let you let your pet go outside when