Ultra clean workbenches are divided into vertical flow ultra clean workbenches and horizontal flow ultra clean workbenches based on the direction of airflow. According to the operation control structure, they are divided into two forms: single-sided operation and double-sided operation. According to their purposes, they can also be divided into ordinary ultra clean workbenches and biological (pharmaceutical) ultra clean workbenches. The biosafety cabinet is designed to protect the operator, laboratory environment, and experimental materials from exposure to infectious aerosols and splashes that may occur during the operation of infectious experimental materials such as primary cultures, bacterial strains, and diagnostic specimens.

The advantages of the ultra clean workbench are convenient and comfortable operation and control, high work efficiency, short preparation time, and the ability to operate after more than 10 minutes of startup. It can be used at any time. Biosafety cabinets are widely used in fields such as healthcare, disease prevention and control, food hygiene, biopharmaceuticals, environmental monitoring, and various biological laboratories. They are an important foundation for ensuring biosafety and environmental safety, and belong to the scope of "people's livelihood" measurement. The biosafety cabinet is designed to protect the operator, laboratory environment, and experimental materials from exposure to infectious aerosols and splashes that may occur during the operation of infectious experimental materials such as primary cultures, bacterial strains, and diagnostic specimens. In factory production, when the vaccination workload is large and requires long-term work, an ultra clean bench is an ideal equipment. The ultra clean bench is powered by a three-phase AC motor with a power of about 145~260W. The air is blown out through the "super filter" composed of special microcellular foam (structure: synthetic resin, plasticizer, stabilizer, pigment) laminations, forming a continuous, dust-free and sterile laminar flow of ultra clean air, which is called "effective special air". It removes more than 0.3 μ Dust, fungi, and bacterial spores from m. The flow rate of ultra clean air is 24-30m/min, which is sufficient to prevent pollution caused by nearby air disturbance. This flow rate will not hinder the use of alcohol (also known as ethanol) lamps or Bunsen lamps for burning and disinfecting instruments. The staff operates under such sterile conditions to ensure that sterile materials are not contaminated during transfer inoculation. But if there is a power outage during the operation, the materials exposed to unfiltered air will be difficult to avoid contamination. At this point, the work should be quickly completed and a mark should be made on the bottle. If the material inside is in the proliferation stage, it will no longer be used for proliferation and will be transferred to rooting culture in the future. If it is a general production material, it can be discarded even if it is extremely abundant. If it has taken root, it can be left for future planting.