DuraLiner chimney liners are designed for the lining of a masonry chimney and can be used for all types of fuels. Dura liner is especially appropriate for use in oversized masonry chimneys that vent open solid-fuel fires. The liners come in both flex and rigid designs. The OvalFlex has a space-saving shape that may be useful in some applications. Both 6" and 8" diameters are available, as well as all the parts necessary for a complete installation.