Powerless Equipments using natural wind is the most suitable type of ventilator for the use today as energy conservation has become one of the most important aspect of a successful industry. It works on the natural movement of wind energy, and works even at the slowest velocity of wind.
Powerless ventilators works on the principle of centrifugal forces it saves electricity. It is utilizes the natural air, when it blows, the spinning blades create a low pressure region that attracts air to go through. This hot, humid, polluted air is replaced by fresh air from outside. Completely reliable, just fit and forget.