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The space between the center and outer walls circulate air for more cooling. The solid insulation fits between the inner and center walls. Three-wall chimney systems use a combination of air-cooled and insulating components. Typically, this insulation consists of a ceramic blanket, mineral wool, or fiberglass. This type of system features a layer of solid insulation between the inner and outer chimney walls. The other type of venting is called a solid pack or fully insulated chimney system. Doing otherwise would create unsafe venting and deviation from standing codes. Thus, these systems make it impossible to substitute other brands of venting. And, almost all manufacturers have proprietary venting systems specific to these appliances. A majority of prefabricated decorative wood-burning fireplaces use such a system. This means they can expand independently and be assembled in individual sections. Most air-cooled chimney systems have two chimney walls that are free-floating. Their design allows for at least two inches of air space between each wall layer. Since air does not insulate as well as a solid material, these chimney systems are usually large. Many systems use two walls, but there are also three-walled systems. Space between the chimney walls allows for outside air to flow freely. As the name implies, air-cooled systems use air for cooling. The first is known as an air-cooled chimney system. Wood burning appliance venting is broken into two primary categories. The purpose of venting systems for wood-burning fireplaces and wood stoves seems similar.