A chimney liner is a structure, usually made of metal, clay tile or poured cement, installed inside the chimney. It functions as a protective membrane and is designed to keep flammable materials and toxic gases contained within the chimney. Chimney liners provide protection against overheating and possible ignition of your residence. Liners also keep carbon monoxide gas from penetrating the chimney structure and seeping into your home.
Although building codes vary from state to state, most fire safety regulations require chimney liners
Read more: Does a Chimney Need a Liner? | eHow.com http://www.ehow.com/way_5769437_chimney-need-liner_.html#ixz