Wood burning Insert, Minimum opening for installation is 16 1/2" to 21" deep x 28 1/2" wide x 21 1/2" high with an approved lined chimney at least 15 ft. high. Only install into a solid fuel burning fireplace. Large viewing area through an elegantly arched cast iron door Effective air wash in combination with high temperatures keeps the viewing glass clean Includes WHISPER QUIET- heat circulating blower Secondary air tube insulated with ceramic fiber and protected with a stainless steel cover