First, let's look at this "220V Cooling Fan" base design, not simply the motor with the power switch, the wind gear combination. The fan base and the wind box can be separated by a bayonet assembled. "220V Cooling Fan" in addition to a motor inside the base outside, the following are covered with dense air inlet hole, the air here is the most primitive parts of lessons. After the motor and fan role, it has a certain stream of air into the interior cavity of the air box. Note that the internal "220V Cooling Fan" wind box is a special cavity structure, rather than a simple metal solid box. Chamber frame toward the positive direction of the fan air is thin, completely closed in the opposite direction thick metal sheet wrapped after leaving a narrow slit in a circle, this gap is the outlet.