Space-Saving Fan Moves Warm Air from Hearth This magnetic four-bladed stove fan helps circulate warm air through your home, saving you money and reducing emissions from burning less fuel. Plus, it's made to mount directly on the flue pipe of your stove, so it saves space too! Works on wood-burning stoves. Starts automatically and adjusts its speed with the stove temperature. No batteries or cords needed - it's powered by the heat of your wood-burning stove. No running costs or assembly required. As the stove heats up, the fan runs faster to move warm air throughout the room rather than just to the ceiling above the stove. Auto starts when temperature reaches 100 degrees F (38 degrees C). When the stove cools down, the fan shuts off. No loud blower noise, it's virtually silent. Four blades. Magnetic - mount to stove pipe. Black. Blades: 4. Dimensions: About 9" x 3-3/4" x 9-7/8". Weight: About 1-1/2 lb.