Classified by exhaust mode
There are three types of fume hoods: upper exhaust, lower exhaust, and upper and lower exhaust. For processes involving cold temperatures, the lower exhaust type should be used to maintain a uniform wind speed in the working area. On the other hand, the upper exhaust type is recommended for hot processes. If the process involves unstable heat, then an upper and lower exhaust vent can be set up to adjust the proportion of exhaust air volume. This ensures uniformity in wind speed by adapting to changes in heat within the cabinet. It is important to choose the right type of fume hood depending on the type of process to be carried out in order to ensure safety and effectiveness.
According to the type of air intake
The full exhaust ventilation cabinet is a popular type that operates by facilitating the circulation of indoor and outdoor air within the cabinet. It is widely used in many applications and industries.
The ventilation cabinet, also known as the air recycling cabinet, is installed in the temperature and humidity control room for the purpose of reducing energy consumption related to heating and air conditioning. Its main function is to recycle the outside air within the cabinet and release it back outside. By implementing this approach, the ventilation cabinet effectively saves energy used in heating and air conditioning systems.
The standard constant air volume fume hood system requires manual adjustment of the air valve with a fixed blade to regulate the exhaust air volume and achieve the desired wind speed. However, variable air volume control has a higher precision as it adjusts the air volume by adapting to the sensor of the valve. It is important to note that variable air volume systems generally have a higher cost compared to the standard type. As such, these systems are typically employed in situations that demand high levels of accuracy.
Classified by usage status
There are various types of fume hoods available, each designed to cater to specific experimental needs. These include the integral lower open fume hood, floor type fume hood, two-side type fume hood, three-side glass type fume hood, table type fume hood, combined type fume hood, and specialized fume hood designed for radioactivity, synthesis, or perchloric acid experiments. It is important to choose the right type of fume hood to ensure the safety and effectiveness of the experiment. With the appropriate fume hood, researchers can carry out experiments confidently and without concern for potential hazards.