DuraVent FasNSeal Flex 3" x 130' Stainless Steel Custom Flex Length o60 A 10 x 20 ft

A 10 x 20 ft patio would use two heaters

the flame can be operated with or without heat

6" 6/12 to 12/12 Pitch Dead Soft Flashing

This item is not suited for use with Propane

DuraVent FasNSeal Flex 3" x 130' Stainless Steel Custom Flex Length o60 A 10 x 20 ftMade 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