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Within the working area the airflow is of vertical and mono-direction,which is a guarantee for protection of samples from air pollution andcross infection.At the operating window there is a strict air screen toseparate the air of indoor and outdoorThe room airflow with high speedat the opening of the safe only goes to the way-out of the safe andharmful air in the safe does not hurt the operators and environment. The biological safe is of intellectual auto-control with voice-photo airflowalarm systems (advanced speed alarm,glass door alarm and filteringpressure difference alarm),which show various parameters of the safe atany time.All the controlling instruments are imported to keep fineworking condition and guarantee no infection of operators.(equal toClass 10 of 209e)and wind feeding and exhausting efficiency of99.99%(DOP ion of 0,1 micro). pressure difference alarm),which show various parameters of the safeat any time.All the controlling instruments are imported to keep fineworking condition and guarantee no infection of operators.