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1.
Differences in the discharge of air flow: 1.
The exhaust air of the A2 type safety cabinet is discharged back into the room after high-efficiency filtration; 2.
The exhaust air of the B2-type safety cabinet is discharged to the outside after high-efficiency filtration
.
Second, the use of the safety cabinet is different: 1.
If the experimental object may escape radioactive gas, toxic irritant gas, please use the B2 type safety cabinet
.
2.
Otherwise, A2 type safety cabinet can be used
.
3.
Differences in ventilation volume: 1.
If you choose a B2 type safety cabinet, please ensure that the laboratory has sufficient ventilation volume, otherwise the inhalation wind speed of the safety cabinet will be too low, causing an alarm and seriously reducing its biological safety
.
2.
A2 is not required
.
4.
Notes for A2.
B2 Since the two types of biological safety cabinets are filtered and then exhausted, there is not much difference between the two types of safety cabinets from a safety point of view
.
However, if the selected B2 biological safety cabinet is used in midsummer or severe winter, due to its large ventilation volume and a large amount of outdoor air flowing into the room, it may cause the laboratory environment to be too hot or cold.
Please fully consider this before selecting a model.
situation
.
Class II A2 biological safety cabinet (1) The minimum inhalation airflow velocity is 0.
5m/s; (2) The vertical airflow is a part of the vertical airflow and the inhaled airflow mixed (not more than 70%); (3) It must be filtered by HEPA, Exhaust gas can be discharged outdoors; (4) All air ducts and static pressure boxes that are polluted by organisms should maintain negative pressure, or be surrounded by negative pressure air ducts and static pressure boxes
.
Class II B2 biological safety cabinet (1) The minimum inhalation airflow velocity is 0.
5m/s; (2) The vertical airflow filtered by HEPA is sent from laboratory or outdoor air (usually called fresh air, that is, the gas discharged from the safety cabinet).
(3) All inhaled airflow and vertical airflow are filtered by HEPA and then discharged into the atmosphere, and do not enter the safety cabinet for circulation or return to the laboratory; (4) All polluted air ducts and static pressure boxes maintain negative pressure, The airflow in the work area is evacuated directly
.
Differences in the discharge of air flow: 1.
The exhaust air of the A2 type safety cabinet is discharged back into the room after high-efficiency filtration; 2.
The exhaust air of the B2-type safety cabinet is discharged to the outside after high-efficiency filtration
.
Second, the use of the safety cabinet is different: 1.
If the experimental object may escape radioactive gas, toxic irritant gas, please use the B2 type safety cabinet
.
2.
Otherwise, A2 type safety cabinet can be used
.
3.
Differences in ventilation volume: 1.
If you choose a B2 type safety cabinet, please ensure that the laboratory has sufficient ventilation volume, otherwise the inhalation wind speed of the safety cabinet will be too low, causing an alarm and seriously reducing its biological safety
.
2.
A2 is not required
.
4.
Notes for A2.
B2 Since the two types of biological safety cabinets are filtered and then exhausted, there is not much difference between the two types of safety cabinets from a safety point of view
.
However, if the selected B2 biological safety cabinet is used in midsummer or severe winter, due to its large ventilation volume and a large amount of outdoor air flowing into the room, it may cause the laboratory environment to be too hot or cold.
Please fully consider this before selecting a model.
situation
.
Class II A2 biological safety cabinet (1) The minimum inhalation airflow velocity is 0.
5m/s; (2) The vertical airflow is a part of the vertical airflow and the inhaled airflow mixed (not more than 70%); (3) It must be filtered by HEPA, Exhaust gas can be discharged outdoors; (4) All air ducts and static pressure boxes that are polluted by organisms should maintain negative pressure, or be surrounded by negative pressure air ducts and static pressure boxes
.
Class II B2 biological safety cabinet (1) The minimum inhalation airflow velocity is 0.
5m/s; (2) The vertical airflow filtered by HEPA is sent from laboratory or outdoor air (usually called fresh air, that is, the gas discharged from the safety cabinet).
(3) All inhaled airflow and vertical airflow are filtered by HEPA and then discharged into the atmosphere, and do not enter the safety cabinet for circulation or return to the laboratory; (4) All polluted air ducts and static pressure boxes maintain negative pressure, The airflow in the work area is evacuated directly
.
