OSF Solar Exhaust FanSolar exhaust fan A Ventilation Kit can be used as an exhauster for the humid air. An exhauster is necessary in the basement or other big buildings, which cant breathe or need extra ventilation. The exhauster will be working at the same time as the solar air collector. Louver outlet with automatic close function, will keep the room heat from losing when fan turns off. Either electricity or solar energy is ok. Max air volume: 160m h. Including: 1 pc,
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