- Variable Air Volume Control: The VAV fume hood is equipped with an advanced air volume control system, usually consisting of a variable air volume damper, a wind speed sensor, a controller, etc. When the operation conditions inside the fume hood change, such as the change in the opening degree of the cabinet door, the wind speed sensor will monitor the change in the face velocity of the fume hood in real time and transmit the signal to the controller. According to the preset face velocity value, the controller automatically adjusts the opening degree of the variable air volume damper, thus changing the exhaust air volume of the fume hood to keep the face velocity of the fume hood always within the set safe range.
- Airflow Organization: Generally, the airflow organization form of upper supply and lower exhaust or upper exhaust is adopted. There is an air supply outlet at the top of the fume hood, and fresh air is evenly supplied into the fume hood from the air supply outlet. Then, there are exhaust outlets at the bottom or rear side of the fume hood to discharge the air containing harmful pollutants inside the cabinet. This airflow organization method can form a stable air curtain barrier, effectively preventing harmful gases from escaping from the fume hood and entering the laboratory environment.
- Cabinet Body: It is usually made of high-quality corrosion-resistant materials, such as all-steel, steel-wood, or PP (polypropylene) and other materials to resist the corrosion of various chemical substances that may be encountered during the experiment. The cabinet body structure is sturdy and can withstand a certain weight and pressure, ensuring the stability and service life of the fume hood.
- Cabinet Door: Generally, it is a sliding glass door that can move up and down or a hinged glass door that can open left and right, with good visibility, which is convenient for experimental personnel to observe the situation inside the fume hood during the operation. The glass door has a certain strength and explosion-proof performance, which can protect the safety of experimental personnel in case of an accident. Some fume hood cabinet doors are also equipped with a balancing device, making the cabinet door easy to operate at different heights and able to stay in any position.
- Workbench Surface: It is made of materials resistant to acid and alkali and high temperature, such as epoxy resin board, solid-core physical and chemical board, etc., with good chemical stability and mechanical properties, which can meet the needs of various experimental operations. The edge of the workbench surface is usually specially treated to prevent liquid leakage.
- Ventilation System: In addition to the core components such as the variable air volume damper mentioned above, it also includes ventilation ducts, fans, etc. The ventilation ducts are generally circular or rectangular metal ducts or plastic ducts, with good airtightness and corrosion resistance. The fans usually use high-performance and low-noise centrifugal fans or axial fans, which can provide sufficient exhaust air volume to ensure the ventilation effect.
- High Safety: It can adjust the air volume in real time according to the actual operation situation to ensure that harmful gas escape can be effectively controlled under various working conditions, providing reliable safety protection for experimental personnel.
- Remarkable Energy Saving Effect: Compared with the traditional constant air volume fume hood, when the cabinet door of the VAV fume hood is closed or opened slightly, it can automatically reduce the exhaust air volume, reducing unnecessary energy consumption and lowering the operating cost of the laboratory.
- Good Flexibility: It can be customized in design and installation according to different experimental needs and laboratory layouts, and can adapt to various complex experimental environments.
- Intelligent Control: It is equipped with an advanced automatic control system, which can realize functions such as remote monitoring and fault alarm, making it convenient for laboratory managers to centrally manage and maintain the ventilation system.
VAV fume hoods are widely used in various chemical laboratories, biological laboratories, pharmaceutical laboratories, scientific research institutions, university laboratories and other places, and are suitable for various chemical experiments, pharmaceutical research and development, biological cultivation and other operations. As long as the experiments involve the generation of harmful gases, fumes or dust and other pollutants, VAV fume hoods can be used to ensure the safety and hygiene of the experimental environment.
