The FFT-100 uses High Speed Linear Induction Jet Ejector burners. These burners are able to induce more air than a traditional venturi burner, resulting in a neutral flame (which results in a cleaner, more efficient burn) across the pressure range, even at the top end where most forges run very rich. The adjustable choke makes the burners fully tuneable. The unique gas jet assembly ensures that the jet is always aligned with the burner tube; no need to mess around with aligning the jet over the tube. The body of the FFT-100 is made out of heavy duty steel, and is designed to be relined about as many times as you like. The burners have their own expansion chamber and are designed to produce a perfect flame, even as the liner begins to break down.