A lightweight mat made of FeCrAlM alloy fibers, G-mat is intended for blue-flame burner applications. It is designed to be added onto existing perforated sheet metal burners to reduce NOX below 10 ppm. The fabric mat insulates the heat and provides a hot combustion bed for the stable combustion of a full aerated fuel/air mixture. The mat reduces combustion emissions, improves flame stability and uniformity, and extends burner life and reliability. Modulation is up to 10:1 in blue flame mode. It is light transparent, which induces a tiny pressure drop of 0.2 to 0.5” w.c. under the normal combustion range.