Looking towards the jet, it's about 1.5mm (.060inch). The pipe is stainless steel with inside diameter of 48mm (1 & 7/8inch).
Air intake end. The gas tube is stainless steel.
This is the good part, the flame is about 900mm (36 inches) long. I have the gas pressure set at nearly 60PSI at the regulator.
A bit closer view of the business end. My furnace is in the background.
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