Laminar Flow cleanroom equipment is used to remove particulate airborne

contamination in the environment. High process technology manufacturing areas

such as microelectronics,

aerospace, pharmaceutical,

medical devices, and food

processing plants; often require

an almost totally dust-free or

germ-free environment in order

to achieve an economical

process yield. Typically,

uncontrolled environments in

urban areas may contain several

million harmful particles per

cubic foot of the air sampled. In addition, the production working and the production

process itself may produce ever larger quantities of harmful airborne contamination.

Laminar Flow cleanroom equipment is designed to remove this contamination from

the air so that it is not transferred onto sensitive product surfaces.

Laminar Flow cleanrooms utilize three basic principles to create a super clean

working environment. The principles which may be used to control a complete room

or a small bench area are:

1. All outside air brought into the clean area is filled with High Efficiency Particulate

Air (HEPA) filters. These filters will remove 99.99% of all particles as small as 0.3

microns in size from a large volume air stream.

2. The HEPA filters are installed to cover one entire surface of the enclosure, i.e.,

ceiling or side wall, so that the entire air mass within the enclosure is uniformly

displayed with the highly filtered air. The average velocity is typically about 90 feet

per minute or 1.5 miles per hour. Although imperceptible to the working, this mass

airflow quickly flushes away any contamination generated in the room by the activity.

3. All access openings and non-clean activities are kept downstream in the moving

airflow. Clean activities are placed upstream as close to the filters as possible.

Thus, the clean airflow itself is used to isolate and protect the clean product.

Laminar flow cleanrooms utilize a

high air volume (as much as 50 to

100 cubic feet per minute per

square foot of area) and low air

velocity (50 to 100 feet per

minute). The air may be

recirculated back to the HEPA

filters in a closed system with air

added only as required for

ventilation. Cleanroom

environments are rated by the

number of particles, 0.5 microns

and larger per cubic foot of air

sampled from the room while the work is in process. The best Laminar Flow rooms

are rated as Class 100(ISO 5), i.e., less than 100 particles per cubic foot of air.

Pure Aire Laminar Flow products are designed and manufactured to provide Class

100 (ISO 5) or better clean air for any activity requiring a dust-free, aseptic, sterile or

germ-free environment. Pure Aire has a reputation of quality and excellence. A

complete line of factory assembled, tested, and certified clean benches and

modular systems is available to create virtually any size cleanroom environment.