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This furnace fan is powered by transforming heat into energy, without using any battery or electricity, energy conservation and environment protections. Easy to use, just put it on the burning furnace, it will automatically absorb thermal energy and drive fan produce wind. Thus it can circulate heat throughtout theroom, increase air circulate speed and promote the furnace’s heating efficiency. The fan’s rotation speed is depends on the temperature of stove, the temperature is higher and the rotation speed is faster. There are 8 colors for you to choose, you can choose according to your demands. Features: This furnace fan is powered by transforming heat into energy, without using any battery or electricity, energy conservation and environment protections. There is a thermoelectric module on the fan as a small generator to drive the motor of fan. Easy to use, just put it on the burning furnace, it will automatically absorb thermal energy and drive fan produce wind. The fan outputs
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