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A Built in Electric Wall Fireplace A built in electric wall fireplace is a device that is installed in an existing opening, completely or partially. It cannot be moved or removed without demolishing an area of the wall. These units are usually plug-in units that come with a variety of flame and heat settings. Some units come with an option for thunder and rain to provide ambience. Size A built-in electric wall fireplace is attached directly to the wall, creating a spacious design that