in order to avoid this series of problems, it is very necessary to choose the exhaust fan, but the selection of exhaust fan is different according to different problems, so what problems should be paid attention to in the selection of exhaust fan? Next, let's take a look with Xiaobian.

classification of exhaust fan

1, turbine exhaust fan

If the turbine exhaust fan is installed on the roof of the factory, it should achieve very good results, because hot air and dirty smoke are often produced in the factory due to the operation of machine tools. According to the principle of "heat expands and cold contracts", the number of air molecules in a certain volume decreases, and the relative geothermal air density is smaller than that of cold air, that is, hot air is lighter than cold air. The cold air descends, so the indoor hot air or dirty smoke will gather near the roof, so the indoor temperature is high and the pressure is high, and with the turbine rotating on the roof and the diversion method, the indoor hot air or dirty smoke will spin out of the room from the gap of the blades. When the hot air is pumped out, the indoor air will generate a low pressure, and the outdoor air is higher than the internal pressure, so the air will flow into the room, filling the pumped hot air space, and then achieving the effects of adjusting the temperature and removing the dirty smoke.

2. Negative pressure exhaust fan

Negative pressure exhaust fan forms a negative pressure environment indoors by exhausting air from inside to outside, and attracts outdoor air into the room to achieve the purpose of ventilation.

the negative pressure exhaust fan is generally installed at the lower air outlet, and it is best not to have obstacles within 3~5 meters around the exhaust outlet. In the practical application of industrial workshop, the negative pressure exhaust fan is usually installed on one side of the workshop, the air inlet is on the other side of the workshop, and the air flows from the air inlet to the negative pressure fan to form convection blowing. In this process, the doors and windows near the negative pressure exhaust fan are kept closed, forcing air to flow into the workshop through the doors and windows at the air inlet side.

air flows into the workshop from the air inlet in an orderly manner, flows through the workshop, and is discharged from the workshop by the negative pressure exhaust fan. The ventilation is thorough and efficient, and the ventilation rate can be as high as 99%. Through specific engineering design and design of ventilation speed and wind speed as required, any high heat, harmful gas, dust and smoke can be quickly discharged from the workshop, and any problem of poor ventilation can be completely solved at one time. Ventilation can be achieved within a few seconds from turning on the fan.

In hot summer, the negative pressure exhaust fan is usually used together with the cooling water curtain, which can reduce the temperature by 5~11℃ in addition to ventilation.

Precautions for the selection of exhaust fans

1. Note for the selection of small exhaust fans: Small exhaust fans can be used for ordinary families, and of course, some industrial exhaust fans specially used for industry can also be selected, because the purpose of industrial exhaust fans is also to eliminate some peculiar smells in the air, and at the same time, it can achieve the purpose of purifying the air, thus maintaining good air circulation.

2. Selection of industrial exhaust fan Note: In some restaurants of this type, the smell of oil in the kitchen is very strong. If the kitchen does not have a good ventilation environment, it will affect the safety of food, thus causing harm to human body. Therefore, it is very necessary to install an industrial exhaust fan in a suitable position for some relatively large restaurants.

3. Selection of window-type exhaust fan Note: This type of exhaust fan has one-way and two-way operation modes, which can not only exhaust indoor air, but also supplement outdoor fresh air indoors. Therefore, it is most suitable to install window-type exhaust fans in bedrooms, kitchens and other rooms. Of course, it is not unreasonable to install them in bathrooms, but it will block outdoor light.

4. Selection of wall-mounted exhaust fan Note: This type can be embedded above the window, but because of the narrow cross section of the exhaust port, the air exchange intensity is weak, so it is only suitable for installation in small spaces such as bathrooms or closed balconies. Another common practice is to install the exhaust fan on the wall of the bathroom, which is a very feasible choice, because most of the water is generated by the shower.

5. The ceiling-mounted exhaust fan has a good appearance and can be installed on the ceiling of the living room. The pipeline of this exhaust fan is short, so it is necessary to buy a ventilation pipe matching with the pipeline when installing.