There is emissions data showing it can burn cleaner than natural gas, or the exhaust gas was safe enough to breathe. That doesn’t represent the whole burn cycle, but it is the cleanest combustion technology on the planet.
The IntensiFire doesn’t use any catalyst or other consumable material to work, it is simply a change of combustion dynamic that creates an intense heat that burns up all the difficult to combust carbon monoxide (CO). CO levels rise below 750°C, and if your firebox was at that temperature it would be glowing red! The IntensiFire tube does get that hot though, check the second image on the home page.
This complete combustion means more heat into your room.