DuraVent DuraPlus 6 in. Galvanized Steel Extended Roof BracketDuraPlus is designed to stay cool on the outside, to provide a hot draft on the inside, to boost stove efficiency and to provide for a fire safe design that protects both the chimney and the building. This triple wall chimney features two insulating layers (ceramic blanket, plus air space). The ceramic blanket insulation is held securely in position, eliminating hot spots common with loose fill type insulations. In the event of a creosote fire, the