4 Blades: Distribute warm air throughout the room, simply place the furnace fan on a flat, smooth surface on top of the furnace, near the side or back of the furnace tube. Anodized Aluminum: The fan assembly is made of anodised aluminum, which will not rust and corrode if the fan overheats. Low noise: The sound is less than 30dB, running quietly, you will enjoy the warm air in a calm and comfortable environment. Small size: This fan is very small and relatively light weight, easy to move. Heat driven: No need to use electricity or batteries, automatically use the heat from the fireplace or fireplace, environmental friendly and energy saving. Increase air circulation: Wind speed up to 0.8 meters per second. Suitable for wood/gas/pellet fuel stoves. Specifications: Color: black Material: Anodized Aluminum Operating temperature: 750°F Blade: 4 blades Wind speed: 436-1470RPM Noise: