DuraVent FasNSeal Flex 4" x 80' Stainless Steel Custom Flex Length btu20000 What are BTU’s

What are BTU’s

Propane (Natural gas orifice included)

This side will give your fireplace a look that you simply have freshly chopped Oak logs for your fire

Diameter 12" Material 316L Stainless Steel Degree Angle 90 Degree

DuraVent FasNSeal Flex 4" x 80' Stainless Steel Custom Flex Length btu20000 What are BTU’sMade 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