In a furnace the re-circulation of products of combustion can substantially contribute to the speed of heating and temperature uniformity. For low temperature ovens and dryers, suitable re-circulating fans are generally provided to achieve temperature uniformity. However, fans are not practical for high temperature furnaces and kilns.Excess air can help in re-circulation but this will result in wastage of fuel. 30% excess air for a 1100 degree centigrade furnace will require additional 24% fuel than stoichiometric firing. In comparison, high velocity gases entrain and re-circulate more than seven times of own volume will eliminate need for fans or excess air. Tempest and Hiram burners are the answer for such applications. Wide range of application, 300 to 1650 degree centigrade operating temperaturesInherently low emissions18, 000 to 500, 000 kcal hr capacity range300 degree centigrade preheated airDurable construction, Dual fuel usageWide air fuel ratio flexibility Application: Ceramic Tunnel and KilnsHeat Treatment FurnacesCar Bottom Furnaces ScrapPreheaters Galvanizing TanksAir Heating and Drying