Allusion Slim Electric FireplaceAllusion Slim Electric Fireplace One of the slimmest electric fireplaces in the industry The Allusion Slim electric fireplace beautifully bridges technology and style. The ultra sleek, four inch depth is one of the slimmest out there, able to be completely recessed into a 2x4 or 2x6 wall, without taking up additional floor space. Its easy to add this fireplace in almost any room (no construction needed) with the optional wall mount & surround kit.