So clean and efficient it has been endorsed by a United States Government Laboratory, click here to transfer to the document.
"Another stunning innovation came from the IntensiFire firebox insert. Although an untraditional stove entry, this insert was New Zealand inventor Jason Stewart’s way to instantly transform an old, dirty wood stove into a clean-burning model of efficiency. Jasons’ low-cost IntensiFire downdraft device fits inside traditional wood stoves and burns wood up to 60 percent more efficiently." David Agrell - Popular Mechanics