DuraVent FasNSeal Flex 4" x 140' Stainless Steel Custom Flex Length w50.38 Despite the misconception that they

Despite the misconception that they are purely decorative

Decorative lava rocks help to make the flame more even

Back-up control system ensures reliable use

Safety bars

8% (LHV) Optimum overall efficiency  72% Optimum heat transfer efficiency 68 % Average particulate emissions rate 0

DuraVent FasNSeal Flex 4" x 140' Stainless Steel Custom Flex Length w50.38 Despite the misconception that theyMade from super ferritic stainless steel. Corrosion resistant. Manufactured with a sure seal locking seam for superior strength and flexibility. The smooth inner wall provides for no output reduction, allowing for full appliance efficiency, ease of cleaning and regular maintenance. The smooth inner wall optimizes gas flow, minimizes back pressure, and facilitates condensate management. Only flexible chimney liner listed to UL 1738 standard. What's