Exhaust fan, driven by the fan to rotate the air flow, so that indoor and outdoor air exchange of a class of air-conditioning appliances. Also known as ventilation fan. The purpose of the exhaust is to remove the indoor dirty air, adjust the temperature, humidity and sensory effects. Exhaust fans are widely used in homes and public places.
The exhaust fan is divided into a partition type (both sides of the partition hole are free space, from one side of the partition to the other side of the ventilation), duct exhaust type (one side from the free space into Gas, and the other side through the catheter exhaust), the catheter into the air (one side through the catheter into the air, while the other side of the free space exhaust), the whole catheter type (exhaust fan on both sides of the catheter placement, Intake and exhaust). (Air flows in the direction parallel to the axis of rotation, parallel to the direction of the shaft), and the axial flow (The direction of air entering and discharging are perpendicular to the direction of the shaft).
Exhaust fan ventilation methods are discharged, inhaled, and used three. Discharge from the natural air intake into the air, through the exhaust fan discharge dirty air; inhalation through the ventilation fan inhalation of fresh air, from the natural exhaust port discharge dirty air; and the use of type is the suction and exhaust by the ventilation fan to complete.
Exhaust fan is a kind of axial fan. Mainly used in negative pressure ventilation and cooling works and called the exhaust fan. Exhaust fan with large air duct, large leaf diameter, large exhaust volume, ultra-low power consumption, low speed, low noise and so on.
And the use of cooling curtains can be used in one fell swoop to solve the problem of ventilation, cooling. The operation of the exhaust fan will be in the room to form a negative pressure environment. If the exhaust fan on the other side of the wall to install the cooling curtain, exhaust fan in the indoor hot air out of the room at the same time, will also be through the cooling curtain into the room containing rich water vapor in the low temperature air into the room, so To achieve the effect of ventilation, cooling.
Exhaust fan out of the air during the process will cause indoor air pressure drop, the indoor air becomes thinner, forming a negative pressure area, the air due to the pressure difference compensation flow into the room. In the practical application of industrial plants, the exhaust fan are usually concentrated on the side of the plant, the air inlet in the other side of the plant, the air from the air inlet to the exhaust fan to form a convection. In this process, near the exhaust fan near the doors and windows to keep closed, forcing the air from the side of the air intake door and window compensation into the workshop. Air lined up, orderly from the air into the workshop, from the workshop through the exhaust fan from the workshop. Ventilation thoroughly, efficient, ventilation rate can be as high as 99%. Through the specific engineering design, according to the need to design ventilation speed and wind speed, any high heat, harmful gases, dust and smoke can be quickly discharged from the workshop, any ventilation problems can be a one-time solution. From the fan to open a few seconds to achieve the effect of ventilation.