"24V DC Cooling Fan" is not compressed air, the principle is similar to an airplane wing, above the ring wall thickness is not uniform, that is the side of the ring diameter is relatively large, on the other side relatively small, so that after blowing out the air from below through the ring, it will weaken the ambient air pressure, which led to the surrounding air, enhance air flow. This is a not only beautiful, but also very practical design. Because the following drive does not require too much air flow, so the noise is very low. Because the drive air driven ambient air, so the wind than the average fan even higher. In addition, the general "24V DC Cooling Fan" is blade cutting air to promote air flow, so unpleasant. And this is a continuous flow of fan air flow, so more comfortable. Also, this fan is not as top-heavy as a general fan, so more stable. "24V DC Cooling Fan" from the people the best control in more than two meters, if the home space is limited in scope, you can select the fan blowing against the wall, then let the wind reflection over.