Including SMARTflow modeling, Model MSC2 has capacity to fire natural gas, propane, and coke oven gas. Staged gas design introduces fuel into primary and secondary air streams while providing up to 10:1 natural gas burner turndown. Burner offers firing rate of 20 to 400 mm Btu/hr and CO levels of less than 100 ppm. NOx emmissions and NFPA Class 1, 2 or 3 rating vary depending on which fuel is used.