Data, brugermanual og montage- og sikkerhedsinstruktion Stinkskabe GB - Flipbook - Side 6
GENERAL INFORMATION
FUNCTION DESCRIPTION
In a fume cupboard or any other enclosed area where
air moves at a certain speed, airflow patterns can arise
from the desired air movements but are themselves undesirable. In fume cupboards, where the ability to contain gases and vapors is established by an airflow from
the room through the open part of the fume cupboard
sash, various internal flow systems are created. In the
air that flows steadily in a specific direction, obstacles
placed in the airflow will create disturbances.
These disturbances can extend significantly beyond
the obstacle itself. The extent and intensity depend
primarily on the shape and orientation of the obstacle
relative to the flow, the airspeed around the obstacle.
The most significant disturbances typically form on
the downstream side of an obstacle. Thus, there is a
difference between the airflow in an empty fume cupboard without a working person in front of it, and the
flows that occur when the fume cupboard is filled with
shelves and setups and a person is working in front of a
more or less open fume cupboard sash
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Similarly, the work performed in the fume cupboard
and traffic in nearby areas can affect the airflow pattern
in the fume cupboard. Mechanical impacts such as
shaking, centrifugation in open centrifuges, and arm
movements can also create significant disturbances.
All these various disturbances can cause momentary
pollution to be released into the breathing zone of
the person working in the fume cupboard. Since these
releases typically originate from areas inside the fume
cupboard where pollution concentration is relatively
high, measurements of the fume cupboard’s ability to
contain health-hazardous or toxic gases and vapors
must be considered.
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Ergo zafe Patologi 19
