Heat powered Fan for stove do not use batteries or electricity to increase the heating efficiency of your stove. This allows the warm air to flow through your room faster. Features: Suitable for wood stoves. Can help you add extra warmth and comfort to your family in winter. Works on the heat generated from your wood stove to help warm up the room faster and more efficiently. No b-attery or plugs needed, powered by the heat from your stove/fireplace. Low start up temperature of only 40°C (104°F). Featured fan blade design, safe and efficient, moving more air in a wider range of furnace temperature. Specifications: Item type: Stove Fan Blade color: Black, golden(optional) Power supply equipment: Heat powered Airflow: Aluminum Airflow: 203CFM Start temperature: 40℃ Working temperature: 50-370℃ Noise level: 0.15-0.18db Recommended distance: 0.1-0.15m Overall height: 217mm Overall width: 188mm The base dimensions: 92 * 75.8mm Package weight: 820g / 1.8pounds Package size: 230 * 200 * 130mm / 9.05 * 7.87 * 5.11inch Attention:The heat powered stove fans does not bring direct temperature increase but only a tool to accelerate the heat transfer of the chimney. Package list: 1 * Stove Fan Thermoelectric test Temperature difference of 20℃ : open circuit voltage 0.98V, power generation current 230MA Difference in temperature of 40 ℃; Open circuit voltage 1.9V; The generating current is 372MA Open circuit voltage 2.4V; Generating current 473MA Open circuit voltage 3.7V; The generating current is 564MA Temperature difference greater than 100 ℃;Open circuit voltage 4.8v;Generating current: 675MA (The current is the short circuit test value) Temperature protector: 50*10*0.6mm(Thermos