Laminar-Flow Enclosures—The required environmental
control of aseptic areas has been made possible by the use of
laminar airflow, originating through a HEPA filter, occupying
one entire side of the confined space. Therefore, it bathes the
total space with very clean air, sweeping away contaminants.
The orientation for the direction of airflow can be horizontal
(Figure 26-8A) or vertical (Figure 26-8B) and may involve a limited area, such as a workbench, or an entire room. Figure 26-9
shows a syringe-filling line in a Grade A/Class 100 area using
vertical laminar airflow. The machine is placed in a conventional clean room with vertical LF provided through either the
ceiling or a LF hood on top of the machine. The machine guarding is a stainless steel frame that can hold the LF hood. The
panes are safety glass. This could be an example of a Restricted
Access Barrier System (RABS), although there are no gloves
installed, thus, requiring doors to be open to access the equipment, which is contrary to the requirements of an authentic
RABS. The area outside the RAB can be maintained at a slightly
lower level of cleanliness than that inside, perhaps Class 10,000
down to Class 1,000.
Critical areas of processing, wherein the product or product
contact surfaces may be exposed to the environment, even for a
brief period of time, must meet Class 100 clean room standards.
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