1.Heat Powered stove fan: This silent wood log burner fan is powered by transforming heat into energy, without using any battery or electricity.This log burner fan for woodburning stoves circulates warm air throughout the room from the heat of your fire stoves or burners.2.Warranty2Years. If you have any question with our mini stove fan please inform us instead of a negative review. we will solve your problem.3.OperatingTemperature:122Fahrenheit/50Celsius~662Fahrenheit/350Celsius, and note it can not be used when the temperautre over 350Celsius,it would damaged the stove fan motor.4.Unique Blades Design: Feature with the unique blades design,The wood burner fire fans can drive more warm air with silent work.5.Attention: No installation required,you only need to place the small wood stove fan on a smooth flat surface of your stove ,near the side or back of the stove pipe. the temperature can not be over 350Celsius/662Fahrenheit when using the stove fan.