... 50-100-200 thousand calorie1.super energy saving ,sky-high heat utilization. It burns semi-bitummous coal about ... a long time at the temperature of 1450 with our special fire-retardants technic.5.Operate easily, ... wind outlet design,also can customize .7.Adopt high-performance centrifugal blower,hight pressure,fast flow rate.8 ... environmental protection standa poultry new style hot air heater with CE