In this video I install the class III flue for a garage heater. Class III flue pipes must be made of stainless steel that is not corrodible by flue gasses, have silicone seals, and a few other specifications that make them safe for modern forced air heating systems. The outer thimble and boot were installed in previous videos:

Howto Locate and Preinstall Shop Furnace Hook Ups Pt. 1 ―    • Howto Locate and Preinstall Shop Fur...  
Howto Locate and Preinstall Shop Furnace HookUps Pt. 2 ―    • Howto Locate and Preinstall Shop Fur...  

In this video I install the inner thimble, and connect the two thimble halves with a riveted patch, then I assemble the flue pipe and screw it to the back of the garage heater. I also install the tshaped flue cap on the exterior. It’s not too hard, but if done incorrectly you could have a leak so pay attention

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