Cleanrooms are spaces kept enclosed and virtually free of contaminants. Dust, bacteria or viruses can inhibit certain types of laboratory work. Cleanrooms are also needed for the production of precision electronic and aerospace equipment.
ISO Standard 14644 describes the air quality for cleanrooms. An older reference is the Federal Standard 209 E “Airborne Particulate Cleanliness Classes in Clean Rooms and Clean Zones.”
The class 100 to 100000 system derives from this federal standard. It is now withdrawn but the standards overlap with ISO levels. The classes refer to the acceptable maximum number of particles of 0.5 micrometers or more in diameter which is acceptable in the air.
A class 10000 cleanroom (also known as ISO 7) permits no more than 352,000 particles of 0.5 micrometers or more per cubic meter. The other criterion for a cleanroom is the number of air changes per hour. A cleanroom exchanges the air for filtered outside air between 60 and 750 times per hour.
Main Features
(1) Assembly structure designed, easy installation and easily moved
(2) Directional wheels can be installed, suitable for small building and high cleanliness area;
(3) Modular design: clean booth can be as small as several square meters and can be as large as hundreds of square meters
(4) It has large useful and effective area; while compared with traditional clean room, it has such features like low investment, high return and stable.
There are more than a few factors to determine what kind of cleanroom you need. Every industry has its own default to begin. The main question to ask is “What kinds of particles are the issue?”
What is the size of the particle? How much air circulation is necessary to ensure that the particles are expelled? What design features to keep airborne particles in check.
Pharmaceutical manufacturers employ cleanrooms meeting ISO 7 and ISO 8 levels. Computer chip manufacturers might require even more precise filtration. A bank might require less precise contaminant reduction.
The Food and Drug Administration (FDA) governs the cleanrooms for the manufacture of food supplements, for example. Certain qualifications must be met on a frequent basis and certified by an independent testing agent.
These tests ensure that the cleanroom environment works effectively. Testing includes an examination of the factors relating to the air supply. These types of tests apply to all cleanrooms.
The testing process begins with a simple test of the cleanroom volume. The volume of air needs to be enough to dilute contamination to acceptable levels or remove contamination entirely. Tests of the incoming air quality ensure that it is not increasing airborne contamination.
The airflow tests confirm that cleanroom air moves from clean to less clean areas. Several spots in the room as well as within the air handling equipment are tested.