The negative pressure fan is a machine that forcibly exhausts the stuffy indoor air to the outside, and any poor ventilation problems can be improved.
 
　　 The negative pressure fan can be used with a wet curtain. It can be installed outside the window of the workshop and can be used for ventilation, or as an exhaust fan. Generally, six units in a 1,000 square meter workshop can be used as a full house. In addition, negative pressure fans are used in a wide range, such as: high temperature or odorous workshops, labor-intensive enterprises, such as clothing factories; ventilation and cooling of greenhouses and livestock farms; or places where some specific minutes require ventilation and cooling. Such as: cotton, wool, hemp and other textile mills.
 
　　The scope of application of negative pressure fan
 
Although negative pressure fans have a wide range of uses, for these manufacturers who use negative pressure fans, many people must be confused by the noise of the negative pressure fans. In the following article, let us understand and solve the noise of the negative pressure fans. Causes and solutions.
 
　　About noise
 
　　 1. When the negative pressure fan is installed, the contact with the window frame is too tight, so that the window frame resonance occurs when the negative pressure fan is running.
 
　　 Solution: appropriately reduce the stuffing between the window frame and the water and air conditioner, and use a softer material to stuff. If the bottom of the installation is not stable, the bottom plate should be padded, and the placement is stable and firm.
 
　　 2. The vibration damping pad or fixing screw of the negative pressure fan base is screwed too tightly, and the vibration absorbing effect is lost, and vibration sound will be produced during operation.
 
　　 Solution: Adjust the screw tightness of the vibration absorbing pad of the negative pressure fan base to make the base surface level.
 
　　3. The power supply voltage is too low, and abnormal noise and vibration are produced when the negative pressure fan starts or runs.
 
　　 Solution: Control the power supply voltage within the rated voltage range. A voltage stabilizer or a power supply regulator can usually be used to stabilize the voltage.
 
　　 4. The fan blades of the negative pressure fan collide with the fan housing (cover).

What is the difference between a negative pressure fan and an exhaust fan?

    Negative pressure fans and exhaust fans are widely used in civil and industrial buildings. What is the difference between the two? Many consumers have such confusion. Next, let's take a look. You can choose suitable ventilation equipment according to your actual situation.

    1. First, understand the definition of negative pressure fan and exhaust fan:

    The negative pressure fan uses the cooling principle of air convection and negative pressure ventilation to naturally suck in fresh air from the door or window opposite the installation site, and quickly and forcefully exhaust the indoor hot air from the room.

    Exhaust fan, a kind of air-conditioning appliance, the blades of which are driven to rotate by a motor to drive airflow, thereby exchanging indoor and outdoor air.

    In contrast, both use air convection to achieve the effect of ventilation and cooling. Compared with exhaust fans, negative pressure fans have obvious advantages and more prominent features.

    2. Applicable occasions of negative pressure fan

    The negative pressure fan is suitable for workshops with high temperature or peculiar smell: such as heat treatment plants, foundries, plastic plants, aluminum profile plants, shoe factories, leather goods plants, electroplating plants and various chemical plants; suitable for labor-intensive enterprises: such as garment factories , Various assembly workshops, Internet cafes, etc.; ventilation and cooling of gardening greenhouses and cooling of livestock farms; especially suitable for places that require cooling and humidity. Such as cotton mills, woolen mills, linen mills, weaving mills, chemical fiber mills, warp knitting mills, stretch mills, knitting mills, silk mills, socks mills and other textile mills; suitable for warehousing and logistics.

    3. Its powerful advantages are:

    1. Low investment and low energy consumption: the same refrigeration rate, the one-time investment is about one-sixth of the air conditioner, and the operating cost is about one-tenth of the air conditioner;

    2. Quick cooling effect: The cooling effect is obvious when used with high-efficiency water curtain wall, which can reduce the temperature to about 28-32 degrees, which is in line with the human body temperature. If the water in the well is used as the water source of the water tank, the effect is better, which can be compared with the effect of the air conditioner;

    3. Maintain good air quality in the working environment: The negative pressure ventilation cooling system integrates ventilation, ventilation, dust removal and cooling to increase the oxygen content of the space and improve work efficiency. The air is fresh and humid, and the air cleanliness can reach 99%.


    4. Efficient and convenient: The intelligent control system can group multiple devices and remotely control the start, stop, cooling and cleaning functions of the unit, which greatly improves the efficiency and convenience.

    The negative pressure fan is actually a large exhaust fan whose main function is to exhaust the air forcefully. However, the size and wind of the negative pressure fan are much larger than the traditional exhaust fan. When the negative pressure fan is working, it quickly pumps the gas and discharges it outward, resulting in a difference in indoor and outdoor air pressure, which naturally produces a large negative pressure, so it is called a negative pressure fan.

    The above is the difference between a negative pressure fan and an exhaust fan. Nowadays, negative pressure fans have become the best choice for cooling and ventilation in modern workshops. Environmental protection and energy saving negative pressure fans will become the mainstream of the ventilation and cooling equipment market.