DuraVent DuraFlex AL 3" Aluminum Coupler h44.375 With the logs' partially charred

With the logs' partially charred exterior and burnt-through bottom log that gives you a view of the flame and embers

Model Number OFG145CG-NG Length 41

Length 11" Technical Dimensions

36" GCUF/GRUF Series Firebox

DuraVent DuraFlex AL 3" Aluminum Coupler h44.375 With the logs' partially charredDuraFlex Aluminum An economical venting system used for relining masonry chimney for natural gas or liquid propane category I, draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent for a wide range of applications, including: natural gas fireplaces, gas fired furnaces, boilers, water heaters, and wall or space heating applications. Protects the masonry chimney from damaging effects of flue product condensation.