Shanghai Xinzhuang Instrument's Biological Safety Cabinet Experimental Bench is designed with strict safety standards to ensure optimal protection for laboratory personnel and the environment. For A1-type biosafety cabinets, the minimum airflow velocity or average at the front window should be at least 0.38 m/s. Approximately 70% of the air is recirculated through a HEPA filter into the work area, while the remaining 30% is filtered and vented out. In contrast, A2-type cabinets require a higher airflow velocity of at least 0.5 m/s (or 100 fpm), with the same 70/30 air distribution ratio. The A2 cabinet also maintains negative pressure around the contaminated area, preventing any leakage of hazardous substances.
Class B biosafety cabinets are directly connected to the lab’s exhaust system. These cabinets are equipped with a fan that is linked to an emergency power source, ensuring continuous negative pressure even during power outages, which is crucial for preventing dangerous gas leaks. The B1 type allows 70% of the air to be exhausted through a HEPA filter, while 30% is recirculated through a supply port HEPA filter. The B2 model is a fully exhausted cabinet, with no internal air recirculation, offering full chemical and biological protection. It is ideal for handling high-risk materials.
The second-level biosafety cabinets are designed to meet the performance requirements of third-level biosafety cabinets, making them the most secure and safest option globally. These cabinets are completely sealed, with 100% exhaust and no internal air circulation. Operators work through gloves attached to the cabinet, commonly referred to as glove boxes. Materials are transferred in and out via a double-door pass-through chamber to prevent contamination. This type of cabinet is suitable for high-risk biological experiments.
An A2-type secondary biosafety cabinet can be used when working with trace amounts of toxic chemicals, provided it has an external drain pipe cover. Unlike standard rigid pipes, this cover includes an intake hole that draws air from the room, helping maintain the balance between intake and exhaust airflow. The cover is connected to an external fan, allowing the cabinet to function properly without disrupting its internal airflow dynamics. Using a sealed duct without the intake hole could create excessive suction, potentially compromising product protection. Therefore, the intake feature is essential for safe operation under these conditions.
Shanghai Xinzhuang Instrument Co., Ltd. is a leading manufacturer specializing in a wide range of laboratory equipment, including biochemical incubators, shaking incubators, constant temperature incubators, mold incubators, thermal cycle meters, shakers, oscillators, agitators, water baths, centrifuges, and electric hot plates. The company combines research, development, production, and sales, offering eight major product lines with over 100 varieties. By leveraging modern technology, Shanghai Xinzhuang continuously improves product quality and innovates new solutions, ensuring alignment with international standards. Its products are sold nationwide and have earned widespread trust due to their high quality and excellent service.
The company’s team upholds the corporate spirit of "unity, truth-seeking, and innovation," and follows the principle of "customer first, quality first, reputation first." We warmly welcome both new and existing customers to visit, collaborate, and grow together, creating a bright future for all.
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