Biosafety cabinet and fume hood

When making decisions between biosafety cabinets and chemical fume hoods, the type of protection required must be considered The fume cupboard only provides personnel protection, while the biosafety cupboard provides personnel, product and environmental protection In addition, you must consider the equipment you will use If there is a small amount of volatiles, the biosafety cabinet may be appropriate However, if the professional industrial hygiene officer or safety officer determines that the amount of volatiles is dangerous, the fume hood may be more appropriate How to use the vertical unidirectional airflow filtered by HEPA in the working area of different biosafety cabinets of biosafety cabinet and ventilation cabinet to protect personnel from the biological hazards and other potentially harmful particles in the air inside the cabinet When the air flowing vertically and unidirectionally downward combines with the suction under the air intake grille and prevents the external air pollutants from entering the work space, the product protection is realized After Zui, the environment is protected because the air is filtered by HEPA before it is exhausted The hood protects the user from toxic or volatile chemicals by delivering air continuously from the user to the work area All air is discharged from the cabinet without HEPA filtration No personnel or environmental protection HEPA filters capture only particles and are completely porous for gases and vapors, so biosafety cabinets (class II) provide the same protection for chemicals that are hazardous to biological particles or do not produce vapors (such as powders) However, some procedures require the use of volatiles Due to the possibility of spark ignition in the cabinet working area, the amount of volatiles must be limited Fume hoods and biosafety cabinets require that, since fume hoods are mainly used in chemical industry, they must meet UL requirements for flammability of materials and effectiveness of air flow characteristics (UL 1805) According to UL 1805, laboratory hoods and cabinets, including fume hoods, were investigated for fire, electrical and mechanical injury risks Most biosafety cabinets are not part of this standard because they are not normally used for large quantities of volatile chemicals The performance of the fume hood is evaluated by adjusting ANSI / ASHRAE 110-1995, which specifies a quantitative test procedure to evaluate the performance (capacity) of the laboratory fume hood NSF International (National Health Foundation) tests biosafety cabinets to ensure that products meet Zui low standards for cabinet classification designed by NSF Biosafety cabinet and a fume hood today, new design innovations pave the way for a new hybrid cabinet, a class II type B2 all exhaust biosafety cabinet is also a fume hood The main exhaust cabinet is widely used in toxicity laboratory and similar applications, in which chemical effluents and clean air are necessary The requirements identified in UL 1805 do not specifically limit the amount of volatiles allowed; however, since biosafety cabinets usually have power outlets or other electrical controls in the work area, the amount of volatiles must be limited due to the possibility of spark ignition in the work area of the cabinet The biosafety cabinet can also be (and UL Listed) used as a fume hood by simply providing a construction in which the power socket and controller are located outside the cabinet Before using the fume hood of exhaust biosafety cabinet, only ensure to meet the UL requirements of electrical / mechanical safety (UL 61010-1), UL requirements of Material Flammability and effectiveness of air flow characteristics (UL 1805), and it has been tested in accordance with ANSI / ASHRAE 110-1995 Shanghai Sujing Industry Co., Ltd if you have any need, you can pass with us at any time Thank you very much for your support and look forward to cooperating with you Thank you & bestragard! Suing Jinghua