The heat stove fan is used to circulate the hot air from the stove throughout the room, instead of rising to the ceiling and staying in a small area. This helps increase the efficiency of fireplaces with less fuel. Features: Powered by heat, no batteries or electricity required. ecological, less consumption. Instead of heat rising vertically with a standard stove, the stove fan uses its blades to deflect hot air horizontally. Whisper-Quiet operation will not disrupt your study, work or playtime. Easy to install. High efficiency; increase the ambient temperature by 41%. The fireplace fan can be started automatically and the speed can be adjusted according to the temperature of the oven. The fan base and blade are anodized aluminum that will not rust or corrode. Specification: Type: 4 Blade Wood Stove Fan Color: Black Power: Thermal Material : aluminum Operating temperature: 85℃ ~350℃ Airflow: about 220CFM Noise: Package List: 1