"220V Cooling Fan" air flow: fan air flow refers to an area of flat speed fan ventilation product. Ventilation area is exports minus scroll area at the projected area of the tongue. Plane speed velocity gas stream through the entire plane, the unit is m3 / s. Flat rate constant, blade impeller diameter, the greater the ventilation area, the greater the cooling fan air flow. Flat rate determined by the rotor speed and air pressure. When the ventilation area must, flat rate, the greater the cooling fan air flow. The greater the cooling fan air flow, the greater the heat absorption of air, when the air flow can be transferred with the week to take away more heat, cooling effect is more obvious, the heat "220V Cooling Fan" of pressure: For proper ventilation, the need to overcome the resistance within the cooling fan ventilation stroke, cooling fan must produce to overcome the resistance of the cooling fan air pressure, changes in the value of the measured fan called hydrostatic pressure, ie, the maximum static pressure and atmospheric differential pressure. "220V Cooling Fan" is the role of gas parallel to the surface of objects and static pressure is measured by a surface perpendicular to the hole out. The gas flow in the desired form of pressure known as kinetic energy into dynamic pressure.