Boone Hearth Heat Powered 2 Blade Stove Fan with Wood Stove Thermometer DOUBLE BLADE DESIGN - This fan circulates heated air at a rate of 100 cubic feet per minute. COMPLETELY SILENT OPERATION - A convenient and unobtrusive addition to your wood stove. NO ELECTRICITY NEEDED - The fan starts spinning autmatically once the stove is hot enough. UNIVERSAL FAN FOR ALL HEATING STOVES - Use it with a wood burning, pellet, coal, or gas stove. FREE STOVE THERMOMETER INCLUDED - This fan comes with a free Boone Hearth magnetic color-coded thermometer.