How to correctly use the 24V DC Cooling Fan it?

First of all, "24V DC Cooling Fan" wind speed should not be too large: modern science believes that the best control in indoor wind speed of 0.2-0.5 m / s, especially in well-ventilated room and have an awful draft in place, fans of the wind speed More is not too large. Secondly, "24V DC Cooling Fan" inappropriate for people blowing straight: straight blow, wind cold easily invade the body, especially in frail or sweating, it is best to let a fan blow in one corner; there, fans should blow go, to use swing fans, for children, the elderly, frail people, but should use less "24V DC Cooling Fan" hair, because "evil of the Cou, the gas will empty", but can adjust fan indoor air, in order to indirectly cool.